1. Department of Radiology, Kitasato University School of Medicine, Sagamihara, Kanagawa, 228-8555, Japan
2. Department of Biochemistry, Kitasato University School of Medicine, Sagamihara, Kanagawa, 228-8555, Japan
3. Department of Animal Science, Kitasato University School of Medicine, Sagamihara, Kanagawa, 228-8555, Japan