1. Perinatology Research Branch; Division of Obstetrics and Maternal-Fetal Medicine; Division of Intramural Research; 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 USA
2. Department of Obstetrics and Gynecology; Wayne State University School of Medicine; Detroit MI USA
3. Department of Obstetrics and Gynecology; University of Michigan; Ann Arbor MI USA
4. Department of Epidemiology and Biostatistics; Michigan State University; East Lansing MI USA
5. Center for Molecular Medicine and Genetics; Wayne State University; Detroit MI USA
6. Department of Microbiology, Immunology, and Biochemistry; Wayne State University School of Medicine; Detroit MI USA
7. Division of Obstetrics and Gynecology; Faculty of Medicine; Pontificia Universidad Católica de Chile Santiago Chile
8. Department of Physiology; Wayne State University School of Medicine; Detroit; MI USA