1. Copenhagen University Hospital Hvidovre; Gastrounit, Medical Division; Kettegaards Alle Hvidovre Denmark 2650
2. Aarhus Kommunehospital; Department of Hepatology and Gastroenterology; Nørrebrogade 44 Aarhus C Denmark DK-8000
3. Division of Medicine, Royal Free Campus, University College London; UCL Institute for Liver & Digestive Health; Rowland Hill Street Hampstead London UK NW3 2PF