[1] Ctr Dis Control & Prevent, Div STD Prevent, Natl Ctr HIV AIDS Viral Hepatitis STD & TB Preven, Atlanta, GA USA
[2] Univ N Carolina, Sch Med, Dept Med, Chapel Hill, NC USA
[3] Univ Washington, Dept Global Hlth, Seattle, WA 98195 USA
[4] Univ Washington, Dept Med, Seattle, WA USA
[5] Univ Washington, Dept Epidemiol, Seattle, WA 98195 USA