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. Division of Reproductive Health, Centers for Disease Control and Prevention, Atlanta, Georgia, USA.
4. U.S. Public Health Service Commissioned Corps, Rockville, Maryland, USA.
5. Department of Pediatrics, Aflac Cancer Center, Emory University School of Medicine, Atlanta, Georgia, USA.