1. Willian R Pritchard Veterinary Medical Teaching Hospital, University of California Davis; California
2. Department of Medicine and Epidemiology; University of California; Davis California
3. Department of Physiological Sciences; Center for Veterinary Health Sciences, Oklahoma State University; Stillwater Oklahoma
4. Department of Veterinary Clinical Sciences; Purdue University, West Lafayette; Indiana IN
5. Stillwater Equine Veterinary Clinic; Stillwater Minnesota