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American Journal of Obstetrics and Gynecology > 2006 > 194 > 3 > 760-767
Preventive Medicine > 1998 > 27 > 6 > 798-807
American Journal of Obstetrics and Gynecology > 2006 > 194 > 3 > 760-767
Preventive Medicine > 1998 > 27 > 6 > 798-807