1. Oesophageal Laboratory; Guys and St Thomas’ NHS Foundation Trust; London; UK
2. Department of Gastroenterology; Guys and St Thomas’ NHS Foundation Trust; London; UK
3. Information Services and Systems; King's College London; London; UK
4. NIHR Nottingham Digestive Diseases Biomedical Research Unit; Nottingham University Hospitals NHS Trust; Queen's Medical Centre; Nottingham; UK