1. University of Veterinary Medicine and Pharmacy in Košice; 041 81 Košice Slovak Republic
2. Faculty of Veterinary Medicine; University of Life Science in Lublin; 20-612 Lublin Poland
3. Veterinary Dermatology Unit; Division of Veterinary Clinical Sciences; Royal (Dick) School of Veterinary Studies and The Roslin Institute; Easter Bush Veterinary Centre; University of Edinburgh; Roslin Midlothian EH25 9RG