Abstract

References
1.
Heyns
O S
(1959 ) Med. Proc., Johannesburg
5 , 121 .
2.
Paramore
R H
(1929 ) J. Obstet. Gynœc., Brit. Emp.
36 , 341 .
3.
Theobald
G W
(1949 ) J. Obstet. Gynœc., Brit. Emp.
56 , 447 .
