1. Department of Radiation Oncology and Image-Applied Therapy , Graduate School of Medicine, Kyoto University, 54 Shogoin-Kawahara-cho, Sakyo-ku, Kyoto 606-8507 , Japan
2. Department of Thoracic Surgery , Graduate School of Medicine, Kyoto University, 54 Shogoin-Kawahara-cho, Sakyo-ku, Kyoto 606-8507 , Japan
3. Department of Biomedical Statistics and Bioinformatics , Graduate School of Medicine, Kyoto University, 54 Shogoin-Kawahara-cho, Sakyo-ku, Kyoto 606-8507 , Japan