[1] Univ Washington, Sch Med, Seattle, WA USA
[2] Publ Hlth Seattle & King Cty, HIV STD Program, Seattle, WA USA
[3] Publ Hlth Seattle & King Cty, Dept Med, Seattle, WA USA
[4] Univ Washington, Seattle, WA 98195 USA
[5] Publ Hlth Seattle & King Cty, STD Clin Harborview, Seattle, WA USA
[6] Univ Washington, Div Allergy & Infect Dis, Med, Seattle, WA 98195 USA