1. Department of Diagnostic Ultrasound & Interventional Radiology, Cancer Institute Hospital of Japanese Foundation for Cancer Research, Tokyo, Japan
2. Department of Diagnostic and Interventional Radiology, Aichi Cancer Center Hospital, Nagoya, Japan
3. Department of Radiology, Chiba University Hospital, Chiba, Japan
4. Department of Radiology, Teikyo University School of Medicine, Tokyo, Japan
5. Department of Gastroenterological Surgery, Aichi Cancer Center Hospital, Aichi, Japan