1 Private Gastroenterological Practice, Gastroklinik, Horgen, Switzerland; Division of Gastroenterology and Hepatology, Medical University Department, Kantonsspital Aarau, Aarau, Switzerland; Second Medical Clinic, Ippokration Hospital, School of Medicine, Aristotle University of Thessaloniki, Thessaloniki, Macedonia, Greece.
2 Department of Gastroenterology, Digestive Diseases and Surgery Institute, Cleveland Clinic London, 33 Grosvenor Place, London, SW1X 7HY, UK.
3 Second Medical Clinic, Ippokration Hospital, School of Medicine, Aristotle University of Thessaloniki, Thessaloniki, Macedonia, Greece.
4 Second Medical Clinic, Ippokration Hospital, School of Medicine, Aristotle University of Thessaloniki, Thessaloniki, Macedonia, Greece; School of Healthcare Sciences, Midwifery Department, University of Western Macedonia, Koila, 50 100 Kozani, Greece.
5 First Laboratory of Pharmacology, School of Medicine, Aristotle University of Thessaloniki Faculty of Health Sciences, Thessaloniki, Greece.
6 Second Medical Clinic, Ippokration Hospital, School of Medicine, Aristotle University of Thessaloniki, Thessaloniki, Macedonia, Greece. Electronic address: jannis@auth.gr.