[1] Univ Ind Santander, Dept Internal Med, Bucaramanga, Colombia
[2] Al Azhar Univ, Fac Med, Cairo, Egypt
[3] Univ Colorado, Div Infect Dis, Anschutz Med Campus, Aurora, CO USA
[4] Fdn Univ Autonoma Amer, Fac Med, Grp Invest Biomed, Pereira, Colombia
[5] Inst Univ Vis Amer, Pereira, Colombia
[6] Univ Cient Sur, Master Clin Epidemiol & Biostat, Lima, Peru
[7] Univ Ind Santander, Dept Internal Med, Calle 18 32-06, Bucaramanga 380002, Colombia