Abstract

References
1.
Brooke
BN
Sampson
P A
. (1964 ) Lancet , ii , 1272 .
2.
Halls
J
Young
AC
. (1964 ) Proceedings of the Royal Society of Medicine , 58 , 859 –860 .
3.
Jones
J Hywel
Chapman
M
. (1969 ) Gut , 10 , 562 –564 .
