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 (NICHD), National Institutes of Health, Bethesda, MD, Wayne State University/the Detroit Medical Center, 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. Division of Reproductive Sciences, Perinatal Institute, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH, USA.
5. Department of Obstetrics, Gynecology and Reproductive Sciences, Department of Anatomy, and Center for Reproductive Sciences, University of California San Francisco, San Francisco, CA, USA.