1. Departments of Veterinary Clinical Sciences (Fransson, Ragle), Animal Science (Park), and Statistics (Evans), Washington State University, Pullman, Washington 99164-7060; the
2. Department of Pathology (Karlstam), National Veterinary Institute, 750 07 Uppsala, Sweden; and the
3. Department of Small Animal Clinical Sciences (Bergstrom, Lagerstedt), Swedish University of Agricultural Sciences, 750 07 Uppsala, Sweden
4. From the