1. Laboratory of Veterinary Internal Medicine, Department of Veterinary Medicine, Faculty of Bioresource Sciences; Nihon University; Fujisawa Kanagawa 252-0880 Japan
2. Laboratory of Veterinary Pathology, Department of Veterinary Medicine, Faculty of Bioresource Sciences; Nihon University; Fujisawa Kanagawa 252-0880 Japan
3. Laboratory of Veterinary Surgery, Department of Veterinary Medicine, Faculty of Bioresource Sciences; Nihon University; Fujisawa Kanagawa 252-0880 Japan