[1] Univ Calif San Francisco, Dept Med, Ctr AIDS Prevent Studies, San Francisco, CA 94143 USA
[2] Yale Univ, Sch Publ Hlth, New Haven, CT USA
[3] George Washington Univ, Dept Psychol, Washington, DC 20052 USA
[4] Univ Georgia, Coll Publ Hlth, Athens, GA 30602 USA
[5] Duke Univ, Dept Psychol & Neurosci, Durham, NC USA
[6] Duke Univ, Duke Global Hlth Inst, Durham, NC USA