BanwellBBar-OrAArnoldDL. Clinical, environmental, and genetic determinants of multiple sclerosis in children with acute demyelination: a prospective national cohort study. Lancet Neurol2011; 10: 436–445.
4.
MedWatch. FDA Drug Safety Communication: Safety update on Progressive Multifocal Leukoencephalopathy (PML) associated with Tysabri (natalizumab). Updated 22April2011, http://www.fda.gov/Drugs/DrugSafety/ucm252045.htm (accessed 28 April 2011).
5.
EllisRBoggildM.Therapy-related acute leukaemia with Mitoxantrone: what is the risk and can we minimise it?Mult Scler2009; 15: 505–508.
6.
RamagopalanSVDymentDAValdarW. Autoimmune disease in families with multiple sclerosis: a population-based study. Lancet Neurol2007; 6: 604–610.
7.
AscherioAZhangSMHernanMA. Hepatitis B vaccination and the risk of multiple sclerosis. N Engl J Med2001; 344: 327–332.
8.
RenouxCSuissaS.Immortal time bias in the study of effectiveness of interferon-beta in multiple sclerosis. Ann Neurol2008; 64: 109-110; author reply 10.
9.
Alonso-MagdalenaLRomero-PinelLMoralE. Anticipation of age at onset in multiple sclerosis: methodologic pitfalls. Acta Neurol Scand2010; 121: 426–428.
10.
AklEAOxmanADHerrinJ. Using alternative statistical formats for presenting risks and risk reductions. Cochrane Database Syst Rev2011; 16: CD006776.