1. Department of Obstetrics and Gynecology, Division of Maternal Fetal Medicine, University of North Carolina-Chapel Hill, Chapel Hill, NC, United States
2. Institute for Environmental Health Solutions, Gillings School of Global Public Health, University of North Carolina-Chapel Hill, Chapel Hill, NC
3. Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, University of North Carolina-Chapel Hill, Chapel Hill, NC
4. School of Nursing, University of North Carolina, Chapel Hill, Nc