1. Royal Free Hospital and the UCL Institute of Liver and Digestive Health; Sheila Sherlock Liver Centre; London UK
2. University of Leicester; Department of Health Sciences; University Road Leicester UK LE1 7RH
3. Royal Free Campus, University College London; Rowland Hill Street Hampstead London UK NW3 2PF
4. PSC Support; PO Box 6945 London UK
5. Coventry University; Centre for Trust, Peace and Social Relations; Coventry UK
6. University of Glasgow; HEHTA; University Ave Glasgow G12 8QQ Glasgow UK
7. University College London; Division of Surgery and Interventional Science; London UK NW3 2QG
8. Copenhagen Trial Unit, Centre for Clinical Intervention Research, Department 7812, Rigshospitalet, Copenhagen University Hospital; Cochrane Hepato-Biliary Group; Blegdamsvej 9 Copenhagen Denmark DK-2100
9. 'Sechenov' First Moscow State Medical University; Center for Evidence-Based Medicine; Pogodinskja st. 1\1 Moscow Russian Federation 119881