1. Department of Radiology, National Hospital Organization, Kanmon Medical Center, Shimonoseki, Japan
2. Department of Radiology, Yamaguchi University Graduate School of Medicine, Ube, Japan
3. Department of Surgery and Clinical Science, Yamaguchi University Graduate School of Medicine, Ube, Japan
4. Department of Gastroenterological, Breast and Endocrine Surgery, Yamaguchi University Graduate School of Medicine, Ube, Japan
5. Department of Surgery, National Hospital Organization, Kanmon Medical Center, Shimonoseki, Japan