1. Department of Medicine, Second Medical Clinic, Aristotle University of Thessaloniki, Ippokration Hospital, Thessaloniki, Macedonia, Greece
2. Pancreaticobiliary Medicine Unit, University College London Hospitals (UCLH), London, UK
3. First Laboratory of Pharmacology, Aristotle University of Thessaloniki, Thessaloniki, Macedonia, Greece
4. Department of Nutritional Sciences and Dietetics, School of Health Sciences, International Hellenic University, Alexander Campus, Thessaloniki, Macedonia, Greece
5. School of Helthcare Sciences, Midwifery Department, University of West Macedonia, Koila, Kozani, Macedonia, Greece
6. Department of Gastroenterology, Theageneio Hospital, Thessaloniki, Macedonia, Greece
7. Department of Gastroenterology, General Military Hospital of Athens, Attiki, Greece
8. Gastroklinik, Private Gastroenterological Practice, Horgen, Switzerland
9. Department of Gastroenterology and Hepatology, University of Zurich, Zurich, Switzerland