[1] Univ Mayor San Simon, Hosp Obrero 2 CNS, Sch Med, Cochabamba, Bolivia
[2] Inst Nacl Enfermedades Resp Ismael Cosio Villegas, Ctr Invest Enfermedades Infecciosas, Mexico City, DF, Mexico
[3] Hosp Italiano Buenos Aires, Div Nephrol, Buenos Aires, DF, Argentina
[4] Hosp Christus Muguerza Alta Especialidad, UANL, Hosp Univ Jose Eleuterio Gonzalez, UDEM, Monterrey, Mexico
[5] Univ Sao Paulo State UNESP, Clin Hosp Botucatu Sch Med, HCFMB, Sao Paulo, Brazil