[1] Univ Penn, Sch Med, Ctr Clin Epidemiol & Biostat, Philadelphia, PA 19104 USA
[2] Harvard Univ, Brigham & Womens Hosp, Dept Med Resident, Sch Med, Boston, MA 02115 USA
[3] Univ Penn, Sch Arts & Sci, Philadelphia, PA 19104 USA
[4] Univ Washington, Dept Med Resident, Washington, DC USA
[5] Hlth Promot & Human Solidar Ctr CEPROSH, Puerto Plata, Dominican Rep
[6] Galvan Hlth Ctr, Santo Domingo, Dominican Rep
[7] Univ Penn, Sch Med, Dept Med Infect Dis, Philadelphia, PA 19104 USA
[8] Univ Penn, Ctr AIDS Res CFAR, Philadelphia, PA 19104 USA