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Seminars in Perinatology > 2011 > 35 > 2 > 74-79
American Journal of Obstetrics and Gynecology > 2010 > 203 > 2 > 179.e1-179.e5
Seminars in Perinatology > 2011 > 35 > 2 > 74-79
American Journal of Obstetrics and Gynecology > 2010 > 203 > 2 > 179.e1-179.e5