William J. Tranquilli, DVM, MS, DACVA, Department of Veterinary Clinical Medicine, College of Veterinary Medicine, University of Illinois, Urbana, Illinois, USAJohn C. Thurmon, DVM, MS, DACVA, Department of Veterinary Clinical Medicine, College of Veterinary Medicine, University of Illinois, Urbana, Illinois, USA.Kurt A. Grimm, DVM, PhD, DACVA, DACVCP, Veterinary Specialist Services, Conifer, Colorado, USA.