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American Journal of Obstetrics and Gynecology > 2004 > 190 > 5 > 1464-1466
American Journal of Obstetrics and Gynecology > 1997 > 177 > 5 > 1213-1218
American Journal of Obstetrics and Gynecology > 2004 > 190 > 5 > 1464-1466
American Journal of Obstetrics and Gynecology > 1997 > 177 > 5 > 1213-1218