1. Alliance for Contraception in Cats and Dogs, Portland, OR
2. Population Medicine and Diagnostic Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY
3. Division of Infectious Diseases, Department of Medicine, School of Medicine, Washington University, St Louis, MO
4. Independent epidemiologist, Chicago, IL
5. Department of Population Health Sciences, Virginia-Maryland College of Veterinary Medicine, Virginia Polytechnic Institute and State University, Blacksburg, VA
6. Animal Behavior and Conservation Program, Hunter College, New York, NY
7. Banfield Pet Hospital, Vancouver, WA
8. Department of Animal Medicine, Production and Health, University of Padua, Padova PD, Italy