1. Department of Radiology, The Jikei University Kashiwa Hospital , 163–1 Kashiwashita, Kashiwa-shi, Chiba 277–0004 , Japan
2. Department of Radiology, The Jikei University Hospital , 3–19–18 Nishi-Shimbashi, Minato-ku, Tokyo 105–8471 , Japan
3. Department of Radiology, Nippon Medical School Clinical Imaging Center for Healthcare , 1–12–15, Sendagi, Bunkyo-ku, Tokyo 113–0022 , Japan