1. 1From the Department of Small Animal Clinical Sciences, College of Veterinary Medicine.
2. 3From the University of Florida, Gainesville, FL 32610; Department of Small Animal Clinical Sciences, Michigan State University, East Lansing, MI 48824.
3. 5From the Department of Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO 80523.
4. 6From the Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, University of Georgia, Athens, GA 30602.
5. 7From the Department of Surgical Sciences, School of Veterinary Medicine, University of Wisconsin-Madison, Madison, WI 53706.
6. 8From the Department of Small Animal Clinical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC 27607.
7. 9From the Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Oklahoma State University, Stillwater, OK 74074.
8. 10From the Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853.
9. 4From the Department of Veterinary Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH 43210.
10. 11From the Department of Veterinary Medicine and Surgery, College of Veterinary Medicine, University of Missouri, Columbia, MO 65211.
11. 12From the Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Iowa State University, Ames, IA 50010.
12. 13From the Department of Clinical Studies, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX 77843.
13. 2From the Statistics Division, Institute of Food and Agricultural Sciences.