1. Digestive Diseases Center, Vítkovice Hospital
2. Faculty of Medicine, University of Ostrava, Ostrava
3. Faculty of Medicine, Palacky University, Olomouc
4. Department of Radiology, Vítkovice Hospital, Ostrava
5. Department of Radiology, Faculty of Medicine and Dentistry, University Hospital Olomouc
6. Institute of Medical Biophysics, Faculty of Medicine
7. 2nd Department of Internal Medicine, University Hospital and Faculty of Medicine, Palacky University, Olomouc, Czech Republic