1. Department of Gastroenterology, Center for Eosophageal Diseases, Guy’s and St. Thomas’ Hospital, London, UK
2. King’s College London, School of Cancer and Pharmaceutical Sciences, London, UK
3. Gastroenterology Unit, Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, Pisa, Italy
4. Guy’s and St. Thomas’ Esophago-gastric Center, London, UK