1. Bureau of HIV, New York City Department of Health and Mental Hygiene, New York, New York, USA
2. Bureau of Sexually Transmitted Infections, New York City Department of Health and Mental Hygiene, New York, New York, USA
3. Division of STD Prevention, National Center for HIV, Hepatitis, STD, and TB, US Centers for Disease Control, Atlanta, Georgia, USA
4. Division of Disease Control, New York City Department of Health and Mental Hygiene, New York, New York, USA