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[\'Departments of Obstetrics and Gynecology, University of Utah Health Sciences Center, Salt Lake City, Utah, University of Texas Medical Branch at Galveston, Galveston, Texas, Northwestern University, Chicago, Illinois, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, Columbia University, New York, New York, University of Texas Health Science Center at Houston, Children\'s Memorial Hermann Hospital, Houston, Texas, University of Pennsylvania, Philadelphia, Pennsylvania, Brown University, Providence, Rhode Island, University of Alabama at Birmingham, Birmingham, Alabama, MetroHealth Medical Center, Case Western Reserve University, Cleveland, Ohio, The Ohio State University, Columbus, Ohio, University of Pittsburgh, Pittsburgh, Pennsylvania, and University of Texas at Austin, Austin, Texas; the George Washington University Biostatistics Center, Washington, DC; and the Eunice Kennedy Shriver National Institute of Child Health and Human Development, Bethesda, Maryland.\']
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