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Univ Iowa, Hosp & Clin, Dept Obstet & Gynecol, Div Maternal Fetal Med,Roy L & Lucille A Carver C, Iowa City, IA 52242 USA Univ Iowa, Hosp & Clin, Dept Obstet & Gynecol, Div Maternal Fetal Med,Roy L & Lucille A Carver C, Iowa City, IA 52242 USA