1. Department of Gastroenterology, Royal Bolton Hospital, Bolton, UK;
2. Department of Gastroenterology, Monash Health, Melbourne, Australia;
3. Department of Gastroenterology, Akershus University Hospital, Akershus, Norway;
4. Gastroenterology Unit, Clinical University Hospital Lozano Blesa, Zaragoza, Spain;
5. Institute of Clinical Medicine, University of Oslo, Oslo, Norway