American Journal of Obstetrics and Gynecology
American Journal of Obstetrics and Gynecology > 1995 > 173 > 1 > 2-9
American Journal of Obstetrics and Gynecology > 1999 > 181 > 6 > 1560-1569
American Journal of Obstetrics and Gynecology > 1995 > 173 > 1 > 2-9
American Journal of Obstetrics and Gynecology > 1999 > 181 > 6 > 1560-1569