1. Department of Clinical Sciences, Kansas State University, Manhattan, KS 66506
2. Diagnostic Medicine/Pathobiology, Kansas State University, Manhattan, KS 66506
3. Science and Technology Center, Hill's Pet Nutrition, Inc., Topeka, KS
4. Kansas State University Animal Resource Facility at the time this study was conducted.
5. Department of Clinical Studies, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA