1 Division of Reproductive Health, National Center for Chronic Disease Prevention and Health Promotion, Centers for Disease Control and Prevention, Atlanta, GA, USA.
2 Division of Viral Hepatitis, National Center for HIV, Hepatitis, STD and Tuberculosis Prevention, Centers for Disease Control and Prevention, Atlanta, GA, USA.
3 Division of Viral Hepatitis, National Center for HIV, Hepatitis, STD and Tuberculosis Prevention, Centers for Disease Control and Prevention, Atlanta, GA, USA; Department of HIV and Global Hepatitis Programme, World Health Organization, Geneva, Switzerland.
4 Division of Reproductive Health, National Center for Chronic Disease Prevention and Health Promotion, Centers for Disease Control and Prevention, Atlanta, GA, USA. Electronic address: apk3@cdc.gov.