1. HPB Unit, Freeman Hospital, Newcastle upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne, United Kingdom
2. Translational and Clinical Research Institute, Newcastle University, Newcastle upon Tyne, United Kingdom
3. Department of Gastroenterology, John Radcliffe Hospital, Oxford University Hospitals NHS Trust, Oxford, United Kingdom
4. Population Health Sciences Institute, Newcastle University, Newcastle upon Tyne, United Kingdom
5. Department of Cellular Pathology, Royal Victoria Infirmary, Newcastle upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne, United Kingdom
6. Statsconsultancy, Amersham, United Kingdom