[1] US Ctr Dis Control & Prevent, Div STD Prevent, Atlanta, GA USA
[2] US Ctr Dis Control & Prevent, Div Sexually Transmitted Dis, Atlanta, GA USA
[3] Washington State Dept Hlth, Infect Dis Assessment Unit, Olympia, WA USA
[4] Calif Dept Publ Hlth, STD Control Bur, Richmond, CA USA
[5] Publ Hlth Seattle & King Cty, HIV STD Program, Seattle, WA USA
[6] New York City Dept Hlth & Mental Hyg, New York, NY USA
[7] San Francisco Dept Publ Hlth, Arches Branch, Populat Hlth Div, San Francisco, CA USA
[8] Baltimore City Dept Hlth, Baltimore, MD USA
[9] Johns Hopkins Sch Med, Baltimore, MD USA