Abstract
References
1.
Coden
J
. (1972 ) Proceedings of the Royal Society of Medicine
65 , 863 .
2.
Gemmell
A A
. (1955 ) Journal of Obstetrics and Gynæcology of the British Empire
62 , 195 .
3.
Ross
E J
. (1972 ) Proceedings of the Royal Society of Medicine
65 , 792 .
4.
Smith
A M
. (1973 ) Journal of Obstetrics and Gynæcology of the British Commonwealth
80 , 848 .
5.
Sutton
D
. (1975 ) British Journal of Radiology
48 , 237 .
6.
Walker
R M
. (1964 ) British Journal of Surgery
51 , 590 .