Abstract
References
1.
Chard
T
. (1976 ) In: Recent Advances in Obstetrics and Gynæcology . Eds.
Stallworthy
J
Bourne
G
. Churchill Livingstone , Edinburgh ; p 105
2.
Hon
E H
. (1958 ) American Journal of Obstetrics and Gynecology
75 , 1215
3.
Robinson
H P
. (1976 ) In: Recent Advances in Obstetrics and Gynæcology . Eds.
Stallworthy
J
Bourne
G
. Churchill Livingstone , Edinburgh ; p 239
4.
Saling
E
. (1964 ) Zeitschrift für Geburtshilfe und Gynäkologie
161 , 262