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American Journal of Obstetrics and Gynecology > 2005 > 193 > 3 Supplement > 1028-1034
American Journal of Preventive Medicine > 1999 > 16 > 3 > 240-243
American Journal of Obstetrics and Gynecology > 2005 > 193 > 3 Supplement > 1028-1034
American Journal of Preventive Medicine > 1999 > 16 > 3 > 240-243