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, 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 & Biostatistics, Michigan State University, East Lansing, MI, USA;
5. Center for Molecular Medicine and Genetics, Wayne State University, Detroit, MI, USA;
6. Center for Research and Innovation in Maternal-Fetal Medicine (CIMAF), Department of Obstetrics and Gynecology, Sótero del Río Hospital, Santiago, Chile;
7. Division of Obstetrics and Gynaecology, Faculty of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile