1. Department of Gastroenterology; Tokyo Medical University Ibaraki Medical Center; Ami Japan
2. Joint Research Center; Tokyo Medical University Ibaraki Medical Center; Ami Japan
3. Department of Gastroenterology; Ushiku Aiwa General Hospital; Ushiku Japan
4. Department of Radiology; Tokyo Medical University Ibaraki Medical Center; Ami Japan
5. Department of Radiation Oncology; Tsukuba University; Tsukuba Japan
6. Research Center for Charged Particle Therapy; National Institute of Radiological Science; Chiba Japan
7. Department of Social Health and Welfare; Ibaraki Prefectural Government; Mito Japan
8. Department of Radiology; Tokyo Medical University; Tokyo Japan