1. North Carolina State University, College of Veterinary Medicine, Raleigh, North Carolina (R.B.F.)
2. Department of Pathobiological Sciences, University of Wisconsin-Madison School of Veterinary Medicine, Madison, Wisconsin (L.J.L.)
3. General Counsel, Animal Health Institute, Washington, DC (K.D.M.)
4. Department of Pathobiological Sciences, University of Wisconsin-Madison School of Veterinary Medicine, Madison, Wisconsin (R.D.S.)
5. Tampa Bay Animal Hospitals, Tampa, Florida (L.V.W.).