1. Department of Radiation Therapy; Japanese Red Cross Society Kyoto Daiichi Hospital; Kyoto-shi, Kyoto Japan
2. Department of Medical Physics and Engineering; Osaka University Graduate School of Medicine; Suita-shi, Osaka Japan
3. Oncology Center, Osaka University Hospital; Suita-shi, Osaka Japan
4. Department of Radiation Oncology; Osaka International Cancer Institute; Osaka-shi, Osaka Japan
5. Miyakojima IGRT Clinic; Osaka-shi, Osaka Japan
6. Department of Radiology; Saiseikai Noe Hospital; Osaka-shi, Osaka Japan