1. Royal Free Hampstead NHS Foundation Trust; Sheila Sherlock Liver Centre; Pond Street Hampstead London UK NW3 2QG
2. Copenhagen Trial Unit, Centre for Clinical Intervention Research, Department 3344, Rigshospitalet, Copenhagen University Hospital; Cochrane Hepato-Biliary Group; Blegdamsvej 9 Copenhagen Denmark DK-2100
3. Royal Free Campus, UCL Medical School; Department of Surgery; 8th Floor South (Hepatology office) Royal Free Hospital, Pond Street London UK NW3 2QG