[1
]
Division of Reproductive Health, National Center for Chronic Disease Prevention and
Health Promotion, Centers for Disease Control and Prevention, Atlanta, Georgia. Electronic
address: sgv0@cdc.gov.
[2
]
Division of Reproductive Health, National Center for Chronic Disease Prevention and
Health Promotion, Centers for Disease Control and Prevention, Atlanta, Georgia.
[3
]
Division of Reproductive Health, National Center for Chronic Disease Prevention and
Health Promotion, Centers for Disease Control and Prevention, Atlanta, Georgia; Division
of Reproductive Endocrinology and Infertility, Department of Gynecology and Obstetrics,
Emory University, Atlanta, Georgia.