American Journal of Obstetrics and Gynecology
American Journal of Obstetrics and Gynecology > 1996 > 175 > 2 > 428-434
American Journal of Obstetrics and Gynecology > 1996 > 175 > 6 > 1498-1501
American Journal of Obstetrics and Gynecology > 2000 > 183 > 5 > 1232-1237
American Journal of Obstetrics and Gynecology > 2005 > 193 > 4 > 1364-1368