1. Department of Gastroenterology, Cambridge University Hospitals NHS Foundation Trust, Cambridge, UK
2. Department of Gastroenterology, Leeds Teaching Hospitals NHS Trust, Leeds, UK
3. Department of Gastroenterology, Royal London Hospital, Barts Health, London, UK
4. Department of Gastroenterology, Brighton and Sussex University Hospitals, Brighton, UK
5. Department of Gastroenterology, St George’s University Hospitals NHS Foundation Trust, London, UK