1. Department of Radiation Oncology and Image-applied Therapy, Graduate School of Medicine, Kyoto University, Kyoto, Japan;
2. Department of Radiation Oncology, Graduate School of Medicine, Yamaguchi University, Ube, Japan;
3. Department of Thoracic Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan;
4. Department of Thoracic Surgery, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan