[1] Univ Nacl Cordoba, Hosp Cordoba, Catedra Med 1, UHMI 3, Libertad 2051, RA-5000 Cordoba, Argentina
[2] Univ Antioquia, Grp Inmunol Celular & Inmunogenet GICIG, Calle 67 53-108, Medellin, Colombia
[3] Univ Nacl Autonoma Mexico, Hosp Gen Reg 1, IMSS, Unidad Invest Epidemiol Clin, Gabriel Mancera 222, Mexico City 03100, DF, Mexico
[4] Univ Nacl Autonoma Mexico, Ctr Med ABC, Sur 136 116, Mexico City 01120, DF, Mexico