[1] Vanderbilt Univ, Sch Med, Nashville, TN USA
[2] Univ Peruana Cayetano Heredia, Inst Med Trop Alexander Humboldt, Lima, Peru
[3] Inst Trop Med, Dept Microbiol, HIV & Retrovirol Res Unit, B-2000 Antwerp, Belgium
[4] Hosp Nacl Cayetano Heredia, Dept Pediat, Lima, Peru
[5] Univ Peruana Cayetano Heredia, Sch Sci Philosophy, Lima, Peru
[6] Vanderbilt Univ, Inst Global Hlth, Nashville, TN USA
[7] Hosp Nacl Cayetano Heredia, Dept Infect Dis Trop & Dermatol Dis, Lima, Peru