[1] Univ N Carolina, Carolina Populat Ctr, Chapel Hill, NC 27402 USA
[2] George Washington Univ, Dept Prevent & Community Hlth, Milken Inst Sch Publ Hlth, Washington, DC USA
[3] Inst Dermatol & Cirugia Piel Dr Huberto Bogaert D, HIV Vaccine Res Unit, Santo Domingo, Dominican Rep
[4] Univ N Carolina, Dept Hlth Behav, Gillings Sch Global Publ Hlth, Chapel Hill, NC USA
[5] Univ N Carolina, Dept Publ Hlth Educ, 1408 Walker Ave,437 Mary Channing Coleman Bldg, Greensboro, NC 27402 USA