[1] Univ Fed Ciencias Saude Porto Alegre, Dept Hepatol, Rua Sarmento Leite 245, BR-90050170 Porto Alegre, RS, Brazil
[2] Univ Vale Taquari, Dept Med, BR-95914014 Lajeado, RS, Brazil
[3] Hosp Sanat Partenon, Dept Applicat & Monitoring Injectable Drugs, BR-90650000 Porto Alegre, RS, Brazil
[4] Hosp Nossa Senhora Conceicao, Dept Epidemiol, BR-91350200 Porto Alegre, RS, Brazil
[5] Massachusetts Gen Hosp, Dept Infect Dis, Boston, MA 02114 USA
[6] Harvard Med Sch, Dept Med, Boston, MA 02114 USA
[7] Hosp Nossa Senhora Conceicao, Dept Infect Dis, BR-91350200 Porto Alegre, RS, Brazil