Abstract
Gender-based violence (GBV) perpetration is a severe problem among youths in schools and the community at large. As most studies focused on adults, this study aimed to investigate factors associated with GBV by male high school students in eastern Ethiopia. An institutional based cross-sectional survey was conducted with 1,109 male students aged 15–24 years in eastern Ethiopia in December 2018 using self-administered WHO Multi-Country Study on Women’s Health and Life Events and UN Multi-Country study on perpetration. Poisson regression model was used to determine the prevalence ratio. Multivariable analysis showed that having girlfriend, chewing khat, drinking alcohol, watching pornography and being sexually active increased the prevalence of perpetrating any type of GBV (emotional, physical, sexual, and overall GBV) by young male in the last 12 months. Compared to those who did not smoke tobacco, smokers had an prevalence of perpetrating emotional violence (adj. PrR = 1.22, 95% CI = 1.03–1.44) and any type of GBV (adj. PrR = 1.15, 95% CI = 1.00–1.31). Young males who had a mother who had completed Grade 9–12 (adj. PrR = 0.75, 95% CI = 0.59–0.96) had a 25% lower prevalence of perpetrating emotional violence compared to male students who had an illiterate mother. Young males who had used illicit drugs, smoked shisha (adj. PrR = 1.39, 95% CI = 1.10–1.77), and were married (adj. PrR = 1.89, 95% CI = 1.15–3.12) had a higher prevalence of perpetrating sexual violence compared to young males who hadn’t used smoked shisha and were not married, respectively. Young males who had discussed reproductive health with their family (adj. PrR = 1.13, 95% CI = 1.03–1.24) and who chewed khat (adj. PrR = 1.26, 95% CI = 1.02–1.55) had a higher prevalence of perpetrating any GBV compared to young men who hadn’t discussed reproductive health with their parents and who hadn’t chewed khat, respectively. Any type of GBV (emotional, sexual, or physical violence) was significantly associated with several individual and relationship factors. Effective prevention and intervention programs should be focused on education of the influence of pornography, prevention of substance use and interventions for those in romantic relationships could all assist in reducing GBV.
Introduction
Gender-based violence (GBV) perpetration is a global severe problem among youths in schools and the community at large. GBV affects youths in a school setting because it hinders education, causes severe psychological and physical harm, reduces students’ willingness to go to school, (Fincham & Smith, 2010; UNGEI, 2014) and reduces students’ achievements at school and at home (Demise et al., 2002). According to the World Health Organization (WHO) Multi-Country Study, UN Multi Country Study, and previous studies, GBV perpetration is defined as at least one or more acts of physical and or sexual, and or emotional violence committed against a partner or non-partner (Abeya et al., 2011; Fulu et al., 2013; Jewkes et al., 2013; Philpart et al., 2009; WHO, 2005b).
GBV reflects the imbalance power between women and men. Gender inequality (i.e., male superiority), and social norms accepting of violence are the key determinants of GBV. In this context, the social attitude that support male superiority and acceptance of violence towards women may increase the likelihood that men commit GBV (Graaff & Heinecken, 2017; Jewkes & Abrahams, 2002). Like other African countries, Ethiopia is a patriarchal society and perpetration of violence is often considered as an acceptable behavior, which supports male dominance and sexual entitlement and the expectation of females to be submissive (Bekele et al., 2012; Berhane, 2004; Central Statistical Agency [CSA] Ethiopia & ICF Macro, 2016; Decker et al., 2013; Gossaye et al., 2003; Graaff & Heinecken, 2017; Jewkes & Abrahams, 2002; Philpart et al., 2009; Worku & Mulugeta, 2002).
Results of a UN Multi-Country study in Asia and the Pacific noted that GBV perpetration was associated with alcohol misuse, sexual practice and sexual domination of women, lack of income, previous history of victimization, norms of masculinity, low empathy, depression, low education, experiences of childhood, and involvement in gangs and related activities (Decker et al., 2013; Fulu et al., 2013; Jewkes et al., 2013).
Several researchers, particularly in developed countries, have identified several individual and relationship factors that were risk factors for GBV perpetration. For example, witnessing parental violence, substance use, watching pornography, and risky sexual behaviors were related to GBV perpetration (Abbey et al., 2003; Abbey et al., 2011; Abbey et al., 2004; Carr & VanDeusen, 2004; Wilkins et al., 2014). However, most of these studies have been conducted at community level.
There is scanty of research focused on GBV perpetration by male high school students for a number of reasons. First, researchers in Africa have examined the risk factors of GBV perpetration particularly focused on sexual violence perpetration among the general population and students in higher educational institutions (Abrahams et al., 2004; Bekele et al., 2012; Chirwa et al., 2018; Philpart et al., 2009; Russell et al., 2014). However, risk factors for psychological and physical violence perpetration have not been studied among youths in a high school setting.
Second, existing studies in Ethiopia have exclusively focused on risk factors for female GBV victimization (Arnold et al., 2008; Bekele et al., 2011; Dibaba, 2007; Mekuria et al., 2015; Worku & Mulugeta, 2002) with the exception of two studies of GBV perpetration by males (Bekele et al., 2012; Philpart et al., 2009). These two studies, conducted in a college and a high school, found that multiple sexual partners and frequent pornography and substance use were significantly associated with sexual violence perpetration by male high school students, (Bekele et al., 2012) and khat use, combined use of alcohol and khat, and witnessing parental violence were risk factors for perpetrating GBV by male college students (Philpart et al., 2009). However, they did not investigate the relationship between risk factors and the types of GBV perpetration.
Third, studying multiple risk factors for GBV perpetration by type of violence can assist in the targeting of interventions and prevention strategies in an emerging country like Ethiopia, where resources must be spent where they will have the most impact. Lastly, young men in eastern Ethiopia are especially vulnerable to risky behaviors such as using khat, smoking tobacco, smoking shisha, and having multiple sexual partners. These risky behaviors are common in this area compared to other regions in Ethiopia (Getinet et al., 2007).
The most common substances used in Ethiopia among young people is khat, alcohol, and shisha. Khat is a leafy green plant (Catha edulis) mostly planted in the eastern and south-western parts of Ethiopia. Young people mostly use this green leaf for recreational purposes, to change their mood and enhance stimulation (Alemayehu, 2012; Philpart et al., 2009). Shisha, traditionally known as “Gaya” in Ethiopia, is a sweetened and flavored substance (tobacco) smoked through a water pipe pot. The young people mostly used shisha as an accompaniment of khat for recreational purposes and social togetherness (Alemayehu, 2012; Philpart et al., 2009).
However, no research has been conducted on these risky behaviors in connection with different types of GBV perpetration in the Ethiopian school setting. Therefore, the present study aimed to investigate multiple factors associated with three forms of GBV perpetration (emotional, physical, and sexual) by male high school students in eastern Ethiopia.
Methods and Materials
Study Area and Sample
An institution-based cross-sectional survey was conducted in East Hararghe Zone (525 km east of Addis Ababa, the capital of Ethiopia), in December 2018. The desired sample size was calculated using a single population proportion formula based on the assumption that the previous research conducted on sexual violence perpetration by male was 70% (Bekele et al., 2012). The study used a multi-stage sampling technique. First, the number of schools and students was obtained from the Zone Education Office. In the second stage, five schools were selected using simple random sampling from the total number of schools in the zone. In the third stage, the classrooms were selected using simple random sampling from each grade level, and all male students from those classes were invited to participate. Students who were absent during data collection were excluded. The study sample was proportionally allocated to each selected school based on their size. A total of 1,109 male students were invited and 1,064 agreed to take part with a response rate of 96.50%.
Data Collection Methods and Tools
Data were collected using pretested self-administered questionnaires. The questionnaires were adapted from the WHO Multi-Country Study on Women’s Health and Life Events survey, the Ethiopian Demographic and Health Survey (EDHS), (CSA Ethiopia & ICF Macro, 2016; Fulu et al., 2013; Jewkes et al., 2013; Straus et al., 1996; WHO, 2005b) and previous relevant published articles (Abeya et al., 2011; Bekele et al., 2012; Philpart et al., 2009). The original questionnaires (female experiences) were changed into male questionnaires (GBV perpetration) for this study by the authors and English instructor. We have changed the way of asking the questions, so they are appropriate to male perpetration rather than female experiences of GBV—the acts of GBV remained the same as in the questions asked of females. These scales have been previously used in Ethiopia to determine GBV perpetration by male college students but the scale for emotional violence has not been validated for college students. Using this scale is valid and reliable because it clearly measures any type of GBV (Abeya et al., 2011; Bekele et al., 2012; CSA Ethiopia & ICF Macro, 2016; Philpart et al., 2009; WHO, 2005b). The survey was translated into Afaan Oromo (the regional language) and back to English by an independent translator to ensure consistency. The survey included socio-demographic factors, sexual history, the experience of substance use, and lastly, perpetration of GBV.
We recruited data collectors who were health professionals (e.g., nursing, public health, psychiatry). Data collectors were male, and aged 24–37 years, and were all spoke Afaan Oromo fluently (the regional language). Three days of intensive training were provided for data collectors and supervisors with emphasis on the study objectives, sampling methods, tools and data collection methods, ethical conduct, details in the information statement, sensitive questions, and the process for addressing any participants who may become distressed. A pre-test was done on 5% of the sample size in one of the non-selected schools in East Hararghe before the commencement of the study. The questionnaires were revised based on the skipping patterns and translations. The study questions were read aloud to the students by data collectors, while the students marked their answers, and questionnaires were then returned to data collectors (whether they were completed or uncompleted) in an envelope and anonymous. Ethical clearance was secured from the University of Newcastle Human Research Ethics Committee (H-2018-0031) and Haramaya University, College of Health and Medical Science (Ref. No. IHRERC /137/2018). This indicates that the study met the Australian National Health and Medical Research Council guidelines for the conduct of research with human participants. Official permission in writing was obtained from the Zonal Education Office Representatives, District office and the school’s principal. As the study involved a single survey, the ethics committee recommended that formal consent was not required. Participants' consent was implied by the completion of the survey. This process would enhance the assurances of anonymity given to the students. Students could decide not to take part by not attending the survey session, or not completing a survey within the survey session (by placing a blank or incomplete survey in the provided envelope). No reason for non-participation or withdrawal were required, and there were no consequences for participation or non-participation.
Measures
Question Used in the Study to Assess Emotional Violence, Sexual Violence and Physical Violence, Eastern Ethiopia, December 2018.
Information regarding socio-demographic variables were measured as follows: childhood residence (urban and rural); educational level (Grade 9, Grade 10, Grade 11, and Grade 12); academic performance (good and above, average, and poor), and marital status (yes married, yes girlfriend, and no). Parents and family living circumstances variables were measured as follows: father’s education (illiterate, grades 1–8 complete, grades 9–12 complete, above Grade 12, and do not know); mother’s education (illiterate, grades 1–8 complete, grades 9–12 complete, above grade 12, and do not know); family help (yes and no); receiving enough pocket money from parents (yes and no); family income status (better-off, average, and poor); witness of violence as a child (yes and no); family control (tight, average, and loose/free); mother’s occupation (farmer, government employee, merchant, housewife, no permanent employee, and other); and father’s occupation (farmer, government employee, merchant, no permanent employee, and other). Substance use and sexual experiences variables were measured as follows: ever chewed khat (yes and no); ever smoked a cigarette (yes and no); ever drunk alcohol (yes and no); peers who drank (yes and no); ever used drugs like “Shisha” (yes and no); ever watched pornography (yes and no); ever had sexual intercourse (yes and no); age of first sexual partner (same as me, older than me, much older than me, other, and don’t know), currently/last 12 months more than one sexual partner (yes and no) and discussed reproductive health issues (sex, contraceptives, and GBV) with family (yes and no). These questionnaires were adapted for use in previous studies in Ethiopia (Abeya et al., 2011; Bekele et al., 2012; CSA Ethiopia & ICF Macro, 2016; Philpart et al., 2009).
Statistical Analysis
Descriptive statistics were calculated. The variance inflation factors (VIF) were calculated to determine whether there were any multicollinearity issues. The model fitness was determined using Pearson’s goodness of fit test. Poisson regression with robust variance estimators was conducted to identify the factors associated with the outcome of interest. Prevalence ratios were calculated to estimate the prevalence of the relationships between explanatory variables and the outcome variable given the potential of odds ratios to overestimate the magnitude of the relationship for variables with a prevalence exceeding 10% as is the case for the reporting of GBV, our outcome variables (Barros & Hirakata, 2003; Lee et al., 2009; Petersen & Deddens, 2008). All variables associated with GBV perpetration, which had a statistically significant p-value <0.2 in the bivariate analysis were entered together in the Multivariable Poisson analysis. All variables with a p-value greater than or equal to 0.2 in the bivariate analysis were excluded. We also considered the findings of the literature review to select the variables entered to bivariate analysis. An adjusted prevalence ratio (Adj. PrR) with 95% CIs was computed to identify the independent factors for each dependent variable, and a p-value <0.05 was used as a measure of statistical significance. The data analysis was executed using STATA, version 16.
Results
Parents and Family Living Circumstances
Family History Among Male High School Students in East Hararghe, Eastern Ethiopia, December 2018.
Note. a daily laborer, driver, self-employed, and janitor.
Among the study participants, 45.21% reported perceiving they were from a better-off family compared to their neighbors. Nearly one-quarter of the respondents had witnessed violence as a child, and 60.15% perceived their family’s control over them as strict.
Substance Use
History of Substance Use Among Male High School Students in East Hararghe, Eastern Ethiopia, December 2018.
Sexual Experiences
Sexual Experience Among Male High School Students in East Hararghe, Eastern Ethiopia, December 2018.
Notes. aYounger than me and unspecified. bMultiple responses.
Associated Factors for Different Types of GBV Perpetration
PrR and 95%CI Bivariate Results for Factors Associated with Different Forms of GBV Committed by 1,109 Male High school Students During the Last 12 Months in East Hararghe, Eastern Ethiopia in December 2018.
Note. PrR = Prevalence ratio; CI = Confidence interval; n (%) = Number and percentage of participants with each risk factors who perpetrated each type of GBV; Boldface numbers = statistically significant; 1 = Reference category
Associated Factors for Emotional Violence Perpetration
PrR and 95% CI for Factors Associated with Different Forms of GBV Committed by 1,109 Male High School Students During the Last 12 Months in East Hararghe, Eastern Ethiopia in December 2018.
Notes. Ref: reference category; *** p < 0.001, **p < 0.05; adj. PrR = adjusted prevalence ratio; CI = Confidence intervals; Boldface numbers = Statistically significant for that outcome; NS = Statistically not significant for that outcome in bivariate analysis. For each outcome, variables included in the multivariable model were considered statistically significant at p < 0.2 in bivariate analysis. Adjusted for all variable included in the models.
Associated Factors for Physical Violence Perpetration
In the multivariable analyses, after adjusting for all variables, only three factors were found to be statistically significant risk factors for physical violence perpetration. Young male students who had a girlfriend (adj. PrR = 1.25, 95% CI = 1.02–1.53), who had watched pornography (adj. PrR = 1.97, 95% CI = 1.64–2.37) or who had had sex (adj. PrR = 1.44, 95% CI = 1.21–1.73) had a higher prevalence of perpetrating physical violence compared to young men who did not have a girlfriend, hadn’t watched pornography, and hadn’t had sex respectively (Table 6).
Associated Factors for Sexual Violence Perpetration
In the multivariable analyses, after adjusting for all variables, four factors remained statistically significant risk factors for sexual violence perpetration. Young male students who had a girlfriend (adj. PrR = 2.11, 95% CI = 1.47–3.05
Associated Factors for any GBV Perpetration
In the multivariable analyses, after adjusting for all variables, marital status, use of substances, watching pornography, being sexually active, and discussing reproductive health with family are factors that were highly associated with any GBV perpetration. Young male students who had a girlfriend (adj. PrR = 1.22, 95% CI = 1.03–1.44) had a higher prevalence of perpetrating any GBV compared to men who hadn’t had a girlfriend. Use of khat and smoking tobacco were also associated with any GBV perpetration, with a young man who chewed khat (adj. PrR = 1.26, 95% CI = 1.02–1.55) and smoked tobacco (adj. PrR = 1.15, 95% CI = 1.00–1.31) having a higher prevalence of perpetrating any GBV compared to young men who hadn’t chewed khat and hadn’t smoked tobacco, respectively. Young male students who had watched pornography (adj. PrR = 1.63, 95% CI = 1.42–1.88) had a higher prevalence of perpetrating any GBV compared to young men who hadn’t watched pornography. Similarly, young male students who had had sex (adj. PrR = 1.36, 95% CI = 1.19–1.57) had a higher prevalence of perpetrating any GBV compared to young men who hadn’t had sex. Young male students who had discussed reproductive health with their family (adj. PrR = 1.13, 95% CI = 1.03–1.24) had a higher prevalence of perpetrating any GBV compared to young men who hadn’t discussed reproductive health with their parents (Table 6).
Discussion
The current study is one of the first school-based studies to investigate the individual and relationship factors associated with different types of GBV perpetration by males in Ethiopian school setting. It adds essential information to available literature concerning risk factors of any GBV perpetration (emotional, physical, or sexual violence). Additionally, no other published research in Ethiopia school setting has examined the risk factors for each type of GBV perpetration. GBV, whether emotional, physical, or sexual violence perpetration, had common factors, including marital status, watching pornography, and having sex. However, chewing khat and discussing of reproductive health with family were mainly associated with any GBV perpetration, whereas the use of shisha was peculiarly related to sexual violence perpetration. Mother education had decreased the risk of emotional violence perpetration.
In this study, it was found that male students who had a girlfriend or were married had a higher prevalence of perpetrating emotional violence, sexual violence, physical violence, and any type of GBV. This finding concurs with prior studies (Philpart et al., 2009). Moreover, intimate partners/boyfriends are the main perpetrators of violence against women (UNFPA & WAVE, 2014; WHO, 2005a). This might be because as couples become intimate, they spend more time together in private. This may give the opportunity for males to commit violence against females. Other explanations may be due to culture and gender norms that are deeply rooted in Ethiopian society, where once in a relationship, males might have an expectation that females are compliant, with regard to sex and in other ways (Kedir & Admasachew, 2010; Le Mat et al., 2019). This suggests that interventions for those in relationships could assist in preventing GBV.
Students who reported watching pornography had a higher prevalence of perpetrating emotional violence, sexual violence, physical violence, and any type of GBV. This finding confirms the results of previous studies around the world (Alemayehu, 2012; Carr & VanDeusen, 2004; Chirwa et al., 2018). This may be due to pornography making youth curious about certain acts that they might then go on to practice, potentially without consent (Alemayehu, 2012; Carr & VanDeusen, 2004; Le Mat et al., 2019). Other researchers have suggested that viewing any sexually explicit material diminishes morals and that specific types of pornography, such as that depicting violence against women, leads to increased violence against women in real life (Lim et al., 2016). Even in the case of non-violent pornography, there is the proposition that people view pornography as ‘real’ rather than fantasy and that this negatively affects attitudes and real-life sexual behavior, specifically when people’s sexual experience is limited, such as in adolescence (Lim et al., 2016). However, more investigation is needed to ascertain the nature of the relationship. This study suggests that educating young people about the potential influence of pornography may be very important in GBV prevention.
Consistent with another studies (Alemayehu, 2012; Chirwa et al., 2018), this study found students who had sex had a higher prevalence of perpetrating emotional violence, sexual violence, physical violence and any type of GBV. Having discussed reproductive health with family had also had a higher prevalence of perpetrating of any GBV perpetration. The possible explanation for this could be the sense of sexual entitlement and supremacy that males have which lets them decide when and how to have sex. This may originate from the dominant patriarchal culture in Ethiopia. Due to culture, society, and religion, males are expected to have sexual knowledge and be sexually active, whereas for females being sexually knowledgeable or active outside of marriage is considered taboo (Bekele et al., 2012; Decker et al., 2013; Gossaye et al., 2003; Jewkes & Abrahams, 2002; Kedir & Admasachew, 2010; Le Mat et al., 2019; Philpart et al., 2009; Worku & Mulugeta, 2002). Taken together, the results of past (Bekele et al., 2012; Decker et al., 2013; Kedir & Admasachew, 2010; Le Mat et al., 2019; Worku & Mulugeta, 2002) and our current research suggest that education around respectful and healthy relationships could be very helpful in preventing GBV.
Students who had used substances (khat, smoked shisha or tobacco) had a higher prevalence of perpetrating emotional violence, sexual violence, and any type of GBV except for physically violent. This result confirms previous studies conducted on this association (Alemayehu, 2012; Philpart et al., 2009; Wirtz et al., 2018). They may commit GBV acts believing substance use is an excuse for their victimizing behavior (Abbey et al., 2003; Abbey et al., 2004; Gossaye et al., 2003). However, it is impossible to predict whether these substances directly cause GBV or not. Further longitudinal study is needed to investigate the nature of relationship. The most common substances used in Ethiopia among young people is khat, alcohol, and shisha. Khat is a leafy green plant (Catha edulis) mostly planted in the eastern and south-western parts of Ethiopia. Young people mostly use this green leaf for recreational purposes, to change their mood and enhance stimulation. Shisha, traditionally known as “Gaya” in Ethiopia, is a sweetened and flavored substance (tobacco) smoked through a water pipe pot. The young people mostly used shisha as an accompaniment of khat for recreational purposes and social togetherness (Alemayehu, 2012; Philpart et al., 2009). Our results suggest that prevention of substance use might help to minimize the GBV.
Students who had a mother who completed Grade 9–12 had a lower prevalence of perpetrating emotional violence. This finding corroborates another study (Chirwa et al., 2018; Jewkes, 2002). This might be explained by educated mothers being less likely to accept traditional gender norms and which might translate into life skills training that incorporates an understanding of respectful relationships and the rights of women (Jewkes, 2002). Our results suggest that improving women’s access to education could assist to reduce GBV.
Overall, the findings of this study suggest that to reduce the long-term effects of GBV, education of women and other factors that improve the status of women might help; interventions in schools especially for students in relationships; and substance use prevention could all assist in preventing GBV. This study also revealed that making male students more responsible, educated, and aware is crucial to prevent GBV. Moreover, this study has used an adequate sample size, which helps to address the marked economic, social, and cultural discrepancies and could be used in the context of eastern Ethiopia for future decision-making.
Implications of the Study
This study used individual and relationship factors for GBV perpetration. Future research should include community-and society-level factors for different forms of GBV as well as involve out-of-school youths to establish risk factors using longitudinal data. Additionally, this research confirms that there is not a lot of research on emotional and physical violence perpetration. Further studies should be conducted among male high school students to better understand this public health problem and in order to facilitate prevention and intervention strategies. Future studies should investigate the culture and gender norm as a risk factors for GBV, as this may help to change social norms exist in society. Moreover, this study confirms the association between any type of GBV and risk factors. This suggests that school-based effective prevention and intervention programs should be urgently designed and targeted on key identified factors to mitigate GBV perpetration among youths in schools.
Strengths and Limitations of This Study
To the best of our knowledge, this is one of the first studies to identify the risk factors of physical, emotional, sexual, and any type of GBV by male high school students in Eastern Ethiopia. This study also used Poisson regression with robust variance estimators to identify factors associated with any type of GBV. However, the findings of this study should be interpreted with caution. The data were collected from male high school students so it may not be generalized to all male youths in Ethiopia or those who drop out of school. The respondents were more likely to over- or under-report their perpetration of GBV due to social desirability bias and recall bias. The study used a cross-sectional study design, which cannot establish a causal pathway or temporal relationship. This study did not consider males as potential victims.
Conclusion
The current study investigated many individual and relationship factors associated with any type of GBV perpetration. Marital status, mother’s education, chewing khat, smoking tobacco, watching pornography, having sex, and discussing reproductive health with family were all associated with different forms of GBV. This study suggests that effective preventions and interventions should be developed for schools and target key identified factors such as; improving mother education, prevention of substance use and interventions for those in relationships could all assist in reducing GBV. Pornography was strongly associated with GBV. More investigation is needed to ascertain the nature of the relationship. However, education authorities could discourage youth to view porn. Substance uses also strongly associated with any type of GBV. Further study is required to investigate the nature of relationship. We also found scant studies on emotional and physical violence perpetration. Future studies should include community- and society-level risk factors for different kinds of GBV, as well as involve out-of-school youths to establish causality using longitudinal data.
Footnotes
Acknowledgements
We want to acknowledge the University of Newcastle, Australia, and Haramaya University, Ethiopia for providing the necessary support and facilities during data collection. We appreciate the study participants, research assistants, and supervisors for their participation in fieldwork. We thank Hirbo Shore and Ibrahim Jemal for their assistance during fieldwork. We also thank Natalia Soeters for her assistance in language editing. We also highly appreciated Mrs. Peta Forder for her technical advice on statistics.
Authors’ Notes
All authors read, provided feedback, and approved the final manuscript.
Declaration of Conflicting Interests
Funding
The author(s) disclosed receipt of the following financial support for the research and/or authorship of this article: The University of Newcastle, Australia, facilitated the study as part of its research training program for PhD students. The University of Newcastle has no role in the design of the study, data acquisition, data analysis, or interpretations of the results of the study. This study didn’t receive any fund.
