1. Department of Radiation Oncology, Faculty of Medicine, Kindai University, 377-2 Ohno-Higashi, Osaka-Sayama, Osaka, Japan
2. Department of Gastroenterology, Faculty of Medicine, Kindai University, Ohno-Higashi, Osaka-Sayama, Osaka, Japan
3. . Department of Medical Physics, Graduate School of Medical Sciences, Kindai University, Ohno-Higashi, Osaka-Sayama, Osaka, Japan