[1] Vanderbilt Univ, Sch Med, Div Infect Dis, Nashville, TN 37203 USA
[2] Fdn Huesped, Buenos Aires, DF, Argentina
[3] Hosp Fernandez, Buenos Aires, DF, Argentina
[4] Univ Peruana Cayetano Heredia, Fac Med, Lima, Peru
[5] Inst Med Trop Alexander von Humboldt, Lima, Peru
[6] Univ Autonoma Honduras, Tegucigalpa, Honduras
[7] Inst Hondureno Seguridad Social, Tegucigalpa, Honduras
[8] Ctr GHESKIO, Port Au Prince, Haiti
[9] Fdn Arriaran, Santiago, Chile
[10] Univ Chile, Fac Med, Santiago 7, Chile
[11] Univ Fed Rio de Janeiro, Rio De Janeiro, Brazil
[12] Hosp Clementino Fraga Filho, Projeto Praca Onze, Rio De Janeiro, Brazil