Abstract
References
1.
Aldridge
A. H.
(1942 ) Amer. J. Obstet. Gynec . 44 , 398 .
2.
Moir
C.
(1940 ) Brit. med. J . (ii ), 773 .
3.
Studdiford
W. E.
(1944 ) Amer. J. Obstet. Gynec ., 47 , 764 .