[1] Coll Med, RA-1405 Buenos Aires, DF, Argentina
[2] Univ Simon Bolivar, Bogota, Colombia
[3] Pontificia Javeriana Univ, San Ignacio Hosp, Bogota, Colombia
[4] Tunal ESE Hosp, Bogota, Colombia
[5] La Nueva Med Ctr, Bogota, Colombia
[6] La Nueva Med Ctr, Bogota, Colombia
[7] Videlmed Med Ctr, Bogota, Colombia
[8] Olaya Med Ctr, Bogota, Colombia
[9] Dept Infect Control & Epidemiol, Bogota, Colombia
[10] Santa Maria Med Ctr, Sucre, Colombia