Abstract

References
1.
Bendixen
G
. (1969 ) Gut
10 , 631 .
2.
Shorter
R G
Spencer
R J
Huizenga
K A
Hallenbeck
G A
. (1968 ) Gastroenterology
54 , 227 .
3.
Thor
D E
Jureziz
R E
Veach
S R
Miller
E
Dray
S
. (1968 ) Nature (Lond.)
219 , 755 .
