1. 2nd Department of Internal Medicine – Gastroenterology and Geriatrics University Hospital Olomouc Faculty of Medicine and Dentistry Palacky University Olomouc Olomouc Czech Republic
2. Department of Surgery University Hospital Brno Faculty of Medicine Masaryk University Brno Czech Republic
3. Department of Gastroenterology and Digestive Endoscopy Masaryk Memorial Cancer Institute Brno Czech Republic