Affiliation: | 1. Gastroenterology Division,Hospital Universitario Clementino Fraga Filho,Federal University of Rio de Janeiro,Rio de Janeiro,Brazil 2. Pathology Division,Hospital Universitario Clementino Fraga Filho,Federal University of Rio de Janeiro,Rio de Janeiro,Brazil 3. Gastroenterology Division,Universitario Clementino Fraga Filho,Federal University of Rio de Janeiro,Rio de Janeiro,Brazil |