1 Department of Metabolism, Digestion and Reproduction, Division of Digestive Diseases, Section of Hepatology, Imperial College London, London, UK; NHS Trust, St Mary's Hospital, London, UK. Electronic address: J.kim@doctors.org.uk.
2 NHS Trust, St Mary's Hospital, London, UK.
3 Department of Metabolism, Digestion and Reproduction, Division of Digestive Diseases, Section of Hepatology, Imperial College London, London, UK; NHS Trust, St Mary's Hospital, London, UK.
4 Department of Metabolism, Digestion and Reproduction, Division of Digestive Diseases, Section of Hepatology, Imperial College London, London, UK.