1. Department of Clinical Sciences, University Animal Hospital; Swedish University of Agricultural Sciences; 750 07 Uppsala Sweden
2. Albano Small Animal Hospital; Rinkebyvägen 21 182 36 Danderyd Sweden
3. Regional Small Animal Hospital; Bagarmossen, Ljusnevägen 17 128 48 Bagarmossen Sweden
4. Department of Pathology; University of Veterinary Medicine; Buenteweg 17 D-30559 Hannover Germany
5. Department of Companion Animal Clinical Sciences; Norwegian School of Veterinary Science; Oslo Norway