Affiliation: | 1. Perinatology Research Branch, Eunice Kennedy Shriver National Institute of Child Health and Human Development/National Institutes of Health/Department of Health and Human Services, Bethesda, MD, and Detroit, MI;2. Department of Obstetrics and Gynecology, University of Michigan, Ann Arbor, MI;3. Department of Epidemiology and Biostatistics, Michigan State University, East Lansing, MI;4. Department of Molecular Obstetrics and Genetics, Wayne State University, Detroit, MI |