[1] Inst Salud Publ Chile, Santiago, Chile
[2] Univ Republica, Fac Quim, Montevideo, Uruguay
[3] Ctr Nacl Referencia ITS INEI ANLIS Dr Carlos Malb, Buenos Aires, DF, Argentina
[4] Minist Salud Publ, Inst Med Trop Pedro Kouri, Havana, Cuba
[5] Inst Nacl Higiene Rafael Rangel, Caracas, Venezuela
[6] Inst Nacl Salud, Bogota, Colombia
[7] Univ Saskatchewan, GASP LAC Coordintating Ctr, Saskatoon, SK, Canada
[8] CDVIR, La Paz, Bolivia
[9] Univ Saskatchewan, Saskatoon, SK, Canada