1. Department of Clinical Sciences, Swedish University of Agricultural Sciences, Uppsala, Sweden
2. Department of Animal Breeding and Genetics, Swedish University of Agricultural Sciences, Uppsala, Sweden
3. Department of Medical Biochemistry and Microbiology, Comparative Genetics and Functional Genomics, Uppsala University, Uppsala, Sweden
4. The Veterinary Defence Society, Knutsford, UK
5. Department of Clinical Science, Lund University, Lund, Sweden