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American Journal of Obstetrics and Gynecology > 1998 > 178 > 6 > 1126-1130
American Journal of Obstetrics and Gynecology > 1997 > 176 > 3 > 656-661
American Journal of Obstetrics and Gynecology > 1998 > 178 > 6 > 1126-1130
American Journal of Obstetrics and Gynecology > 1997 > 176 > 3 > 656-661