1. From the Departments of Veterinary Pathobiology and
2. the Division of Animal Sciences, and
3. Veterinary Medicine and Surgery,
4. From the Departments of Veterinary Pathobiology and the 4Mason Eye Institute, University of Missouri, Columbia, Missouri;
5. the Mason Eye Institute, University of Missouri, Columbia, Missouri;
6. the School of Veterinary Science, University of Queensland, Queensland, Australia;
7. the Centre for Preventive Medicine, Animal Health Trust, Newmarket, Suffolk, United Kingdom;
8. the Departments of Basic Veterinary Sciences and 8Medical Genetics, Program in Molecular Medicine, University of Helsinki and Folkhälsan Research Center, Helsinki, Finland;
9. the Department of Veterinary Medicine, University of Cambridge, Cambridge, Cambridgeshire, United Kingdom; and
10. Davies Veterinary Specialists, Hitchin, Hertfordshire, United Kingdom.