Affiliation: | 1Department of Veterinary and Comparative Anatomy, Pharmacology and Physiology, Department of Clinical Medicine and Surgery, College of Veterinary Medicine, Washington State University, Pullman, WA 99164. 2San Luis Rey Equine Clinic, 4211 Holly Lane, Bonsall, CA 92003. 3Department of Veterinary Pathobiology, College of Veterinary Medicine, Texas A&M University, College Station, "IX 77843. |