共 12 条
[1]
BURMEISTER RE, 1969, OBSTET GYNECOL, V34, P310
[3]
Everett HS, 1931, AM J OBSTET GYNECOL, V22, P1
[6]
ONYEBEKE W, 1987, AM J OBSTET GYNECOL, V156, P924
[7]
POWERS E G, 1948, Tex State J Med, V44, P457