1. Department of Surgery, Odense University Hospital, Odense Denmark
2. Department of Biochemical Sciences, Pomeranian Medical University, Szczecin, Poland
3. Gastroenterology and Endoscopy Unit, University Hospital of Parma, University of Parma, Parma, Italy.
4. Department of Gastroenterology, Skåne University Hospital, Malmö, Lund University, Sweden
5. Department of Gastroenterology, University Hospital “Tsaritsa Yoanna – ISUL”, Medical University Sofia, Bulgaria
6. Gastroenterology Unit, Valduce Hospital, Como, Italy
7. University Division of Gastroenterology, City of Health and Science University Hospital, Turin, Italy
8. Department of Gastroenterology, Pomeranian Medical University, Szczecin, Poland
9. The Centre for Digestive Diseases, Endoklinika, Szczecin, Poland
10. Department of Social Medicine & Public Health, Pomeranian Medical University, Szczecin, Poland