1. School of Health Sciences; Kagoshima University Faculty of Medicine; 8-35-1 Sakuragaoka Kagoshima 890-8506 Japan
2. Department of Surgical Oncology and Digestive Surgery; Kagoshima University; Kagoshima Japan
3. Department of Radiology; Kagoshima University; Kagoshima Japan
4. Frontier Science Research Center; Kagoshima University; Kagoshima Japan