1. Division of Reproductive Endocrinology and Infertility, Department of Gynecology and Obstetrics, Emory University School of Medicine, Atlanta, Georgia, USA.
2. Department of Epidemiology, Rollins School of Public Health, Emory University, Atlanta, Georgia, USA.
3. Department of Pediatrics, Aflac Cancer Center, Emory University School of Medicine, Atlanta, Georgia, USA.