1. Division of Genetics, Departments of Pediatrics and Obstetrics and Gynecology, Tufts-New England Medical Center, Boston, MA
2. Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
3. Department of Obstetrics & Gynecology, David Geffen School of Medicine, University of California, Los Angeles, CA
4. Department of Biostatistics, Boston University, Boston, MA
5. Department of Obstetrics and Gynecology, Boston Medical Center, Boston, MA