1. The Cochrane Hepato-Biliary Group; Copenhagen Trial Unit; Centre for Clinical Intervention Research; Copenhagen University Hospital; Copenhagen Denmark
2. Clinic of Internal Diseases Propedeutics, Gastroenterology and Hepatology; I.M. Sechenov First Moscow State Medical University; Moscow Russia
3. Dipartimento di Scienze Biomediche e Cliniche “L. Sacco”; Università degli Studi di Milano; Milan Italy
4. Sheila Sherlock Liver Centre; Royal Free Hospital and the UCL Institute of Liver and Digestive Health; London UK