1. Division of Gastroenterology, Hepatology, and Nutrition, Center for Swallowing and Esophageal Disorders; Vanderbilt University Medical Center; Nashville Tennessee
2. FMUSP and Nucleus of General and Specialized Surgery; Sao Paulo Brazil
3. Gastroenterology and Endoscopy Unit; Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, and Department of Pathophysiology and Transplantation, Università degli Studi; Milan Italy
4. Gastrointestinal Endoscopy Unit, Department of Gastrointestinal Surgery; Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo; São Paulo Brazil
5. Department of Hepatogastroenterology; IKEM; Prague Czech Republic
6. Department of Surgery; Medical University of Vienna; Vienna Austria