1. Department of Digestive Endoscopy and Gastroenterology, Santa Casa Hospital, Bagé, Brazil
2. Department of Digestive Endoscopy, Universidade Federal de Santa Catarina, Florianópolis, Brazil
3. Basil Hirschowitz Endoscopic Center of Excellence, University of Alabama, Birmingham, USA
4. Department of Gastroenterology, Santa Casa Hospital, Porto Alegre, Brazil