1. Department of Veterinary Pathology, College of Veterinary Medicine, 212 Connaway Hall, University of Missouri, Columbia, Missouri 65201, United States of America
2. Department of Veterinary Pathology, College of Veterinary Medicine, 212 Connaway Hall, University of Missouri, Columbia, Missouri 65201, United States of America; Bionetics Research Laboratories, Kensington, Maryland 20795, U.S.A.
3. Department of Veterinary Pathology, College of Veterinary Medicine, 212 Connaway Hall, University of Missouri, Columbia, Missouri 65201, United States of America; Veterinary Research Institute, University of Melbourne, Melbourne, Australia