1. Department of Gastroenterology and Hepatology, VU University Medical Centre, Amsterdam, The Netherlands
2. Department of Gastroenterology and Hepatology and Inserm U954, Nancy University Hospital, Lorraine University, Vandoeuvre-lès-Nancy, France
3. Department of Gastroenterology, Meander Medical Centre, Amersfoort, The Netherlands
4. Department of Gastroenterology, Guy’s and St Thomas’ Hospitals, London, UK
5. Department of Gastroenterology, Pneumology and Endocrinology, Universitätsklinikum Erlangen, University of Erlangen-Nürnberg, Germany
6. Department of Gastroenterology, Christchurch Hospital, Christchurch, New Zealand
7. Department of Gastroenterology, Mount Sinai Hospital, New York, NY, USA
8. Department of Gastroenterology, AP-HP, Hôpital Saint-Antoine,UPMC University, Paris, France
9. Purine Research Laboratory, Guy’s and St Thomas’ Hospitals, London, UK
10. Department of Gastroenterology, Geriatrics, Internal and Intensive Care Medicine [Co-MIK], Zuyderland Medical Centre, Heerlen-Sittard-Geleen, The Netherlands