1. Division of Gastroenterology & Hepatology University of Michigan Ann Arbor MI USA
2. Department of Surgery, Oncology and Gastroenterology University of Padua Padua Italy
3. Department of Gastroenterology & Hepatology Amsterdam University Medical Center Amsterdam the Netherlands
4. Department of Gastroenterology The First Affiliated Hospital Sun Yat‐Sen University Guangzhou China
5. Department of Translational Research and New Technologies in Medicine and Surgery University of Pisa Pisa Italy
6. Division of Gastroenterology & Hepatology Center for Esophageal Diseases University of California San Diego La Jolla CA USA
7. Department of Gastroenterology & Hepatology Flinders University Adelaide SA Australia