共 13 条
[1]
BRACERO L, 1986, OBSTET GYNECOL, V68, P654
[2]
DIVON MY, 1987, 34TH P ANN M SOC GYN
[3]
ERSHKINE RLA, 1985, BR J OBSTET GYNAECOL, V92, P605
[10]
HICKS CR, 1973, FUNDAMENTAL CONCEPTS, P100