1. Faculty of Veterinary Medicine; University of Helsinki; Pohjoinen pikatie 800 04920 Saarentaus Finland
2. National Veterinary and Food Research Institute, Regional Laboratory; PO Box 198 60101 Seinajoki Finland
3. Department of Clinical Veterinary Sciences, Faculty of Veterinary Medicine; University of Helsinki; PO Box 57 00014 University of Helsinki Finland
4. Lihakunta; PO Box 147 70101 Kuopio Finland