[1] Univ Cient, Fac Hlth Sci, Clin Epidemiol & Biostat, Lima, Peru
[2] Lebanese Amer Univ, Gilbert & Rose Mari Chagoury Sch Med, Beirut, Lebanon
[3] Univ Nacl Autonoma Mexico, Inst Matemat, Unidad Juriquilla, Juriquilla, Queretaro, Mexico
[4] Univ Autonoma San Luis Potosi, Sch Med, Microbiol Dept, San Luis Potosi, Mexico
[5] Univ Cuauhtemoc San Luis Potosi, Sch Med, San Luis Potosi, Mexico