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; Bethesda MD
2. Detroit MI USA
3. Detroit Medical Center; Hutzel Women's Hospital; Detroit MI USA
4. Department of Obstetrics and Gynecology; Wayne State University School of Medicine; Detroit MI USA
5. Department of Obstetrics and Gynecology; University of Michigan; Ann Arbor MI USA
6. Department of Epidemiology and Biostatistics; Michigan State University; East Lansing MI USA
7. Center for Molecular Medicine and Genetics; Wayne State University; Detroit MI USA
8. Department of Obstetrics and Gynecology; University of Perugia; Perugia Italy