1. Department of Radiology, Kochi Medical School, Kochi University, Nankoku, Kochi 783‑8505, Japan
2. Department of Radiology, Health care system JINSEI‑KAI Hosogi Hospital, Kochi 780‑0926, Japan
3. Division of Radiology, Medical School Hospital, Kochi University, Nankoku, Kochi 783‑8505, Japan
4. Department of Gastroenterology and Hepatology, Kochi Medical School, Kochi University, Nankoku, Kochi 783‑8505, Japan