Abstract

References
1.
DeVoe
R W
Pratt
J H
(1948 ) American Journal of Obstetrics and Gynecology 56 , 1119 .
2.
Studdiford
W E
(1942 ) American Journal of Obstetrics and Gynecology 44 , 487 .
3.
Winder
A E
Bergman
W D
Fields
C F
(1957 ) American Journal of Obstetrics and Gynecology 74 , 170 .
4.
Wolf
C G
Kritzer
L
DeBold
C
(1979 ) Obstetrics and Gynecology 34 , 757 .
