American Journal of Obstetrics and Gynecology
American Journal of Obstetrics and Gynecology > 2000 > 183 > 5 > 1166-1169
American Journal of Obstetrics and Gynecology > 2000 > 183 > 5 > 1176-1179
American Journal of Obstetrics and Gynecology > 2000 > 183 > 5 > 1180-1183