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Univ Fed Rio Grande do Sul, Div Gastroenterol, Hosp Clin Porto Alegre, Grad Course Med Sci Surg,Sch Med, BR-90046900 Porto Alegre, RS, Brazil Univ Fed Rio Grande do Sul, Div Gen Surg, Hosp Clin Porto Alegre, Grad Course Med Sci Surg,Sch Med, BR-90046900 Porto Alegre, RS, Brazil