American Journal of Obstetrics and Gynecology
American Journal of Obstetrics and Gynecology > 1995 > 172 > 2 Part 1 > 626-630
American Journal of Obstetrics and Gynecology > 1996 > 175 > 2 > 484-488
American Journal of Obstetrics and Gynecology > 1996 > 175 > 4 Part 1 > 800-805