1. Dept. of Internal Medicine, Hospital Poprad, Banícka 28, Poprad, Slovak Republic
2. Institute of Parasitology of the Slovak Academy of the Science, Hlinkova 3, Košice, Slovak Republic
3. Transplant Centre, 1st Dept. of Surgery, University Hospital, Tr. SNP 1, Košice, Slovak Republic
4. Dept. of Radiology, University Hospital, Tr. SNP 1, Košice, Slovak Republic
5. Dept. of Pathology, University Hospital, Tr. SNP 1, Košice, Slovak Republic
6. Dept. of Surgery, University Hospital, Tr. SNP 1, Košice, Slovak Republic
7. 1st Dept. of Internal Medicine, University Hospital, Tr. SNP 1, Košice, Slovak Republic