1. Division of Medicine, Royal Free Campus, University College London; UCL Institute for Liver & Digestive Health; Rowland Hill Street Hampstead London UK NW3 2PF
2. Saarland University Medical Centre; Department of Medicine II; Kirrberger Str. 100 Homburg/Saar Germany 66421
3. Dayanand Medical College & Hospital; Department of Gastroenterology; Tagore Nagar, Civil Lines Ludhiana Punjab India 141001
4. Aarhus University Hospital; Department of Hepatology and Gastroenterology; Nørrebrogade 44 Aarhus 8200 N Denmark
5. Copenhagen University Hospital Hvidovre; Gastrounit, Medical Division; Kettegaards Alle 30 Hvidovre Denmark 2650