1 Rutgers Robert Wood Johnson Medical School, New Brunswick, NJ.
2 Division of Epidemiology and Biostatistics, Department of Obstetrics, Gynecology, and Reproductive Sciences, Rutgers Robert Wood Johnson Medical School, New Brunswick, NJ; Cardiovascular Institute of New Jersey and Department of Medicine, Rutgers Robert Wood Johnson Medical School, New Brunswick, NJ; Department of Biostatistics and Epidemiology, Rutgers School of Public Health, Piscataway, NJ; Environmental and Occupational Health Sciences Institute, Rutgers Robert Wood Johnson Medical School, Piscataway, NJ.
3 Division of Maternal-Fetal Medicine, Department of Obstetrics, Gynecology, and Reproductive Sciences, Rutgers Robert Wood Johnson Medical School, New Brunswick, NJ 08901. Electronic address: jsb288@rwjms.rutgers.edu.