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Univ Penn, Dept Obstet & Gynecol, Perelman Sch Med, Div Maternal Fetal Med,Maternal & Child Hlth Res, Silverstein 2, Philadelphia, PA 19104 USA Univ Penn, Dept Obstet & Gynecol, Perelman Sch Med, Div Maternal Fetal Med,Maternal & Child Hlth Res, Silverstein 2, Philadelphia, PA 19104 USA