1. 2nd Department of Medicine, Charles University in Praha, Faculty of Medicine at Hradec Králové, University Teaching Hospital, Sokolska 581, 500 05 Hradec Králové, Czech Republic
2. Department of Gastroenterology, Vitkovice Hospital, Zalužanského 1192/15, 703 00 Ostrava-Vítkovice, Czech Republic
3. The Fingerland Department of Pathology, Charles University in Praha, Faculty of Medicine at Hradec Králové, University Teaching Hospital, Sokolska 581, 500 05 Hradec Králové, Czech Republic