1. *Perinatology Research Branch, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, U.S. Department of Health and Human Services, Bethesda, MD, and Detroit, MI;
2. †Department of Obstetrics and Gynecology, Wayne State University School of Medicine, Detroit, MI;
3. ‡Department of Obstetrics and Gynecology, University of Michigan, Ann Arbor, MI;
4. §Department of Epidemiology and Biostatistics, Michigan State University, East Lansing, MI;
5. ¶Center for Molecular Obstetrics and Genetics, Wayne State University, Detroit, MI;
6. ‖Detroit Medical Center, Detroit, MI; and
7. #Department of Biochemistry, Microbiology, and Immunology, Wayne State University School of Medicine, Detroit, MI