1. Department of Veterinary Radiology; College of Bioresource Sciences, Nihon University; Fujisawa Kanagawa 252-8510 Japan
2. Japan Animal Referral Medical Center Co., Ltd.; Kawasaki Kanagawa 213-0032 Japan
3. Department of Applied Biochemistry, School of Engineering; Tokai University; Hiratsuka Kanagawa 259-1292 Japan
4. Laboratory Animal Science, College of Bioresource Sciences; Nihon University; Fujisawa Kanagawa 252-8510 Japan
5. Animal Medical Center; Tokyo University of Agriculture and Technology; Fuchu Tokyo 183-0054 Japan