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, Maryland, and Detroit Michigan
2. Department of Obstetrics and Gynecology Wayne State University School of Medicine Detroit Michigan
3. Department of Obstetrics and Gynecology University of Michigan Ann Arbor Michigan
4. Department of Epidemiology and Biostatistics Michigan State University East Lansing Michigan
5. Center for Molecular Medicine and Genetics Wayne State University Detroit Michigan
6. Department of Pathology, Hutzel Women’s Hospital Wayne State University School of Medicine Detroit Michigan
7. Department of Physiology Wayne State University School of Medicine Detroit Michigan
8. Faculty of Medicine, Institute for Clinical Medicine University of Oslo Oslo Norway
9. Division of Obstetrics and Gynecology Oslo University Hospital Oslo Norway
10. C.S. Mott Center for Human Growth and Development Wayne State University School of Medicine Detroit Michigan
11. Department of Immunology, Microbiology and Biochemistry Wayne State University School of Medicine Detroit Michigan