[1] Univ Calif Los Angeles, David Geffen Sch Med, South Amer Program HIV Prevent Res SAPHIR, Div Infect Dis,Dept Med, Los Angeles, CA 90095 USA
[2] Brown Univ, Alpert Med Sch, Providence, RI 02912 USA
[3] Univ Peruana Ciencias Aplicadas, Escuela Med, Lima, Peru
[4] Asociac Civil Via Libre, Lima, Peru
[5] Univ Texas Hlth Sci Ctr Houston, McGovern Med Sch, Dept Internal Med, Div Infect Dis, Houston, TX 77030 USA
[6] Georgetown Univ, Dept Internal Med, Div Internal Med Pediat, Washington, DC 20057 USA