1. Department of Diagnostic and Interventional Radiology, Aichi Cancer Center Hospital, Aichi, Japan;
2. Department of Diagnostic Radiology, National Cancer Center Hospital, Tokyo, Japan;
3. Division of Interventional Radiology, Shizuoka Cancer Center, Sizuoka, Japan;
4. Department of Diagnostic and Interventional Radiology, Osaka University Graduate School of Medicine, Osaka, Japan;
5. Sumitomo Bakelite Co., Ltd, Tokyo, Japan