Abstract

References
1.
Bennett
J R
Atkinson
M
. (1966 ) Lancet
ii , 1150
2.
Bernstein
L M
Baker
L A
. (1958 ) Gastroenterology
34 , 760
3.
Casten
D
. (1964 ) Arch. Surg.
88 , 255
4.
Code
C F
Kelley
M J
Jr
Schlegel
J F
Olsen
A M
. (1962 ) Gastroenterology
43 , 521
5.
Gillison
E W
Capper
W M
Airth
G R
Gibson
M J
Bradford
I
. (1969 ) Gut
10 , 609
6.
Palmer
E D
. (1955 ) Arch. Path. (Chic.)
59 , 51
7.
Squire
B H
Glick
S
Benn
A
. (1968 ) Thorax
23 , 683
8.
Svoboda
A C
Knaver
C M
Camble
C N
(1967 ) Gastrointest. Endosc.
13 , 14
9.
Williams
C B
Lawrie
J H
Forrest
A P M
. (1967 ) Lancet
i , 184
