1. Department of Radiology, Kochi Medical School, Nankoku, Kochi 783‑8505, Japan
2. Department of Radiology, JINSEI‑KAI Hosogi Hospital, Kochi‑shi, Kochi 780‑0926, Japan
3. Department of Radiology, Kobe University Hospital, Kobe, Hyogo 650‑0017, Japan
4. Department of Radiology, National Hospital Organization Kochi Hospital, Kochi‑shi, Kochi 780‑8077, Japan
5. Integrated Centre for Advanced Medical Technologies, Kochi Medical School, Nankoku, Kochi 783‑8505, Japan
6. Department of Neurology, Kochi Medical School, Nankoku, Kochi 783‑8505, Japan