Abstract

References
1.
Davies
J N P
,
Wilson
B A
&
Knowelden
J
(1958 ) Brit. med. J . ii , 439
2.
Sullivan
R D
,
Miller
E
&
Sykes
M P
(1959 ) Cancer
12 , 1248
3.
Trussell
R R
&
de B Mitford-Barberton
G
(1961 ) Lancet
i , 971
