1. Royal Free Unit for Endoscopy, The Royal Free Hospital and University College London (UCL) Institute for Liver and Digestive Health, London NW3 2QG, UK
2. Department of HPB Surgery and Liver Transplant, Royal Free Hospital NHS Foundation Trust, London NW3 2QG, UK
3. Neuroendocrine Tumour Unit, The Royal Free Hospital, Pond Street, London NW3 2QG, UK
4. Gastroenterology and Endoscopy Unit, Fondazione IRCCS Policlinico San Matteo, 27100 Pavia, Italy
5. Gastroenterology and Endoscopy Unit, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico Milano, 20122 Milan, Italy