1. Department of Obstetrics and Gynecology, Sótero del Río Hospital, Center for Research and Innovation in Maternal-Fetal Medicine (CIMAF), Santiago, Chile;
2. Division of Obstetrics and Gynecology, Faculty of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile;
3. Perinatology Research Branch, Program for Perinatal Research and Obstetrics, 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, MD, and Detroit, MI, USA;
4. Department of Obstetrics and Gynecology, University of Michigan, Ann Arbor, MI, USA;
5. Department of Epidemiology and Biostatistics, Michigan State University, East Lansing, MI, USA;
6. Department of Molecular Obstetrics and Genetics, Wayne State University, Detroit, MI, USA;
7. Department of Obstetrics and Gynecology, Wayne State University School of Medicine, Detroit, MI, USA;
8. Department of Pathology, Sótero del Río Hospital, Santiago, Chile