1. Perinatology Research Branch, Program for Perinatal Research and Obstetrics, Division of Intramural Research, Eunice Kennedy Shriver National Institute of Child Health and Human Development, NIH/DHHS, Bethesda, MD, and Detroit, MI, USA;
2. Department of Obstetrics and Gynecology, University of Michigan, Ann Arbor, MI, USA;
3. Department of Epidemiology and Biostatistics, Michigan State University, East Lansing, MI, USA;
4. Center for Molecular Medicine and Genetics, Wayne State University, Detroit, MI, USA;
5. Department of Obstetrics and Gynecology, Wayne State University School of Medicine, Detroit, MI, USA