Abstract

References
1.
Fisher
E R
Hicks
J
(1960 ) Gastroenterology
38 , 458
2.
Gerber
B C
Shields
T W
(1960 ) Arch. Surg . 81 , 379
3.
von Schmid
M
Wenzl
H
Uehlinger
E
(1963 ) Schweiz. med. Wschr . 93 , 444
4.
Williams
E D
Celestin
L R
(1962 ) Thorax
17 , 120
