1. Department and Clinic of Internal Medicine; University of Veterinary Science; Istvan u.2. H-1078 Budapest Hungary
2. Department and Clinic of Surgery and Ophthalmology; University of Veterinary Science; Istvan u.2. H-1078 Budapest Hungary
3. Department of Anatomy and Histology; University of Veterinary Science; Istvan u.2. H-1078 Budapest Hungary
4. Department of Pathology; Faculty of Veterinary Medicine; Utrecht University; Yalelaan 1 3508 TD Utrecht The Netherlands
5. Pannon University of Agriculture; Diagnostic Centre; Guba S.u.40. H-7401 Kaposvar Hungary