Affiliation: | 3. Clinical Epidemiology Unit, Department of Medicine, Karolinska Hospital, Karolinska Institute, Stockholm;4. Clinical Research Centre, Örebro University Hospital, Örebro;5. Department of Medicine, Section for Gastroenterology and Hepatology, University Hospital, Umeå;12. Division of Gastroenterology and Hepatology, University Hospital, Lund;8. Centre for Clinical Research, Central Hospital, Västerås;9. Division of Gastroenterology and Hepatology/IKE, University Hospital, Linköping, Sweden |