1. Department of Public Health Sciences, College of Behavioral, Social and Health Sciences, Clemson University, Clemson, South Carolina
2. Department of Epidemiology, Fielding School of Public Health, University of California, Los Angeles
3. Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Prisma Health, Greenville, South Carolina
4. University of South Carolina School of Medicine, Greenville, South Carolina