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Stanford Univ, Sch Med, Dept Obstet & Gynecol, Div Maternal Fetal Med, 300 Pasteur Dr,H303, Stanford, CA 94305 USA Stanford Univ, Sch Med, Dept Obstet & Gynecol, Div Maternal Fetal Med, 300 Pasteur Dr,H303, Stanford, CA 94305 USA