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American Journal of Obstetrics and Gynecology > 1996 > 175 > 4 Part 1 > 1013-1017
American Journal of Obstetrics and Gynecology > 1996 > 174 > 3 > 1056-1060
American Journal of Obstetrics and Gynecology > 1996 > 175 > 4 Part 1 > 1013-1017
American Journal of Obstetrics and Gynecology > 1996 > 174 > 3 > 1056-1060