1. Laboratory of Veterinary Pathology, Department of Basic Veterinary Medicine, Obihiro University of Agriculture and Veterinary Medicine, Nishi 2-11, Inada-cho, Obihiro, Hokkaido 080-8555, Japan
2. Laboratory of Veterinary Internal Medicine, Department of Clinical Veterinary Medicine, Obihiro University of Agriculture and Veterinary Medicine, Nishi 2–11, Inada-cho, Obihiro, Hokkaido 080-8555, Japan