[1] Univ Sao Paulo, Hosp Clin HCFMUSP, Dept Gastroenterol, Fac Med, Sao Paulo, SP, Brazil
[2] Univ Sao Paulo, Hosp Clin HCFMUSP, Div Gastroenterol & Hepatol Clin, Dept Gastroenterol,Fac Med, Sao Paulo, SP, Brazil
[3] Univ Sao Paulo, Hosp Clin HCFMUSP, Fac Med, Inst Crianca & Adolescente ICr, Sao Paulo, SP, Brazil
[4] Univ Sao Paulo, Hosp Clin HCFMUSP, Fac Med, Lab Gastroenterol Clin & Expt LIM07, Sao Paulo, SP, Brazil