Abstract

References
1.
Roth
J A
Parekh
M A
(1978 ) New England Journal of Medicine
299 , 776 .
2.
Schramek
A
Weisz
G M
Erlik
D
(1971 ) Digestion
4 , 103 –108 .
3.
Sinar
D S
Demaria
A
Kataria
Y P
Thomas
F B
(1977 ) Digestive Diseases
22 , 252 –254 .
