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