1. Department of Small Animal Clinical Sciences, School of Veterinary Medicine & Biomedical Sciences, Texas A&M University, College Station, TX
2. Department of Family Medicine, School of Medicine, University of Washington, Seattle, WA
3. Department of Epidemiology, School of Public Health, University of Washington, Seattle, WA
4. Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, University of Georgia, Athens, GA
5. Department of Population Health Sciences, Virginia-Maryland College of Veterinary Medicine, Virginia Polytechnic Institute and State University, Blacksburg, VA