1. Department of Gastroenterology and Hepatology, Radboud Institute for Molecular Life Sciences, Radboud University Medical Centre , Nijmegen , The Netherlands
2. Occupational Medicine, Department of Gastroenterology and Hepatology, Radboud University Medical Centre , Nijmegen , The Netherlands
3. Radboud Institute for Health Sciences, Department for Health Evidence, Radboud University Medical Centre , The Netherlands
4. Department of Gastroenterology and Hepatology, Franciscus Gasthuis and Vlietland , Rotterdam , The Netherlands
5. Department of Gastroenterology and Hepatology, Medical Spectrum Twente , Enschede , The Netherlands
6. Department of Gastroenterology and Hepatology, Onze Lieve Vrouwe Gasthuis , Amsterdam , The Netherlands
7. Department of Gastroenterology and Hepatology, Jeroen Bosch Hospital , ’s-Hertogenbosch , The Netherlands
8. Department of Gastroenterology and Hepatology, Radboud University Medical Centre, Nijmegen, The Netherlands and Division of Gastroenterology, Department of Medicine, University of Alberta , Edmonton , Canada