American Journal of Obstetrics and Gynecology
American Journal of Obstetrics and Gynecology > 2000 > 183 > 2 > 469-475
American Journal of Obstetrics and Gynecology > 2000 > 183 > 2 > 431-437
American Journal of Obstetrics and Gynecology > 2000 > 183 > 3 > 662-668