1. Department of Animal Sciences and Industry; Kansas State University; Manhattan KS USA
2. Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, Iowa State University; Ames IA USA
3. Department of Clinical Sciences; Kansas State University; Manhattan KS USA
4. Department of Diagnostic Medicine and Pathobiology; College of Veterinary Medicine, Kansas State University; Manhattan KS USA
5. Department of Animal Pathology, Division of Veterinary Pharmacology and Toxicology; University of Turin; Turin Italy
6. Department of Anatomy and Physiology; College of Veterinary Medicine, Kansas State University; Manhattan KS USA