1. Department of Gastroenterology and Gastrointestinal Endoscopy, Pontifical Catholic University of Rio Grande do Sul
2. Department of Gastroenterology and Gastrointestinal Endoscopy, Porto Alegre Health Science’s Federal University, Porto Alegre, Brazil
3. Department of Gastroenterology, Beth Israel Deaconess Medical Center, Boston, Massachusetts, USA
4. Department of Gastroenterology, Federal University of Juiz de Fora, Juiz de Fora
5. Department of Gastroenterology, Federal University of Pernambuco, Recife
6. Department of Endoscopy, Barretos Cancer Hospital, Barretos, Brazil
7. Department of Gastroenterology and Gastrointestinal Endoscopy, IRCCS San Raffaele Scientific Institute, Milan, Italy