1. HPB endoscopy unit, Royal Free Hospital NHS Trust, London, UK
2. Department of Medical and Surgical Sciences, University of Bologna, Italy
3. Neuroendocrine Tumour Unit, Centre for Gastroenterology, Royal Free Hospital NHS Trust, London, UK
4. Department of Gastroenterology, University College London Hospitals NHS Foundation Trust, London, UK
5. Department of Cellular Pathology, Royal Free London NHS Foundation, London, UK
6. Institute for Liver & Digestive Health, University College London, UK