1. Kansas State University College of Veterinary Medicine, Manhattan, Kansas.
2. U.S. Department of Agriculture, Animal and Plant Health Inspection Service, Veterinary Services, Centers for Epidemiology and Animal Health, Fort Collins, Colorado.
3. University of Minnesota College of Veterinary Medicine, St. Paul, Minnesota.
4. Department of Veterinary and Biomedical Sciences, University of Minnesota, St. Paul, Minnesota.
5. American Association of Swine Veterinarians, Perry, Iowa.