1. Department of Radiology, Kitasato University School of Medicine, Kitasato, Sagamihara, Kanagawa 228-8555, Japan
2. Norman Bethune University for Medical Science, Xinmin Dajae, Chungchun, 130021, P. R. China
3. Animal Science, Kitasato University School of Medicine, Kitasato, Sagamihara, Kanagawa 228-8555, Japan
4. Electron Microscopy, Kitasato University School of Medicine, Kitasato, Sagamihara, Kanagawa 228-8555, Japan
5. Cyclotron Research Center, Iwate Medical University, 348-58 Tomegamori, Takizawa, Iwate, 020-0173, Japan
6. Nishina Memorial Cyclotron Center, Japan Radioisotope Association, 348-58 Tomegamori, Takizawa, Iwate, 020-0173, Japan