Institute of Liver and Digestive Health, University College London, United Kingdom. Comprehensive Clinical Trials Unit, University College London, United Kingdom. Glasgow Royal Infirmary, Glasgow, United Kingdom. Barts and the London School of Medicine and Dentistry Queen Mary University of London. National Institute for Health Research Nottingham Biomedical Research Centre at Nottingham University Hospitals NHS Trust and the University of Nottingham, Queens Medical Centre, Nottingham. Mid and South Essex NHS Foundation Trust, Basildon & Thurrock University Hospitals NHS Foundation Trust, Honorary Consultant in Gastroenterology, Hepatology and Hepatobiliary Medicine, The Royal Free Hospital, Honorary Senior Lecturer, University College London, Honorary Senior Clinical Lecturer, Kings College London.