American Journal of Obstetrics and Gynecology
American Journal of Obstetrics and Gynecology > 1998 > 178 > 1 Part 1 > 24-32
American Journal of Obstetrics and Gynecology > 1998 > 178 > 1 Part 1 > 13-19
American Journal of Obstetrics and Gynecology > 1998 > 178 > 3 > 474-478