[1] Minist Hlth, Dept Surveillance Prevent & Control STI HIV AIDS, Brasilia, DF, Brazil
[2] Polaris Observ, Ctr Dis Anal, Lafayette, CO USA
[3] Univ Sao Paulo, Hosp Clin, Div Gastroenterol & Hepatol, Med Sch, Sao Paulo, Brazil
[4] Univ Fed Sao Paulo, Dept Gastroenterol, Sao Paulo, Brazil
[5] Univ Fed Sao Paulo, Dept Infect Dis, Sao Paulo, Brazil
[6] Univ Sao Paulo, Ribeirao Preto Sch Med, Dept Med, Ribeirao Preto, SP, Brazil
[7] Univ Sao Paulo, Sch Med, Inst Trop Med, LIM 52, Sao Paulo, Brazil