1. Department of General Thoracic Surgery, Osaka University Graduate School of Medicine, Osaka, Japan
2. Department of General Thoracic Surgery, Chiba University Graduate School of Medicine, Chiba, Japan
3. Division of Chest Surgery, Department of Surgery, Aichi Medical University, Aichi, Japan
4. Department of Thoracic Surgery, National Cancer Center Hospital, Tokyo, Japan
5. Department of Thoracic Surgery, National Cancer Center Hospital East, Chiba, Japan
6. Department of Thoracic Surgery, Shinshu University School of Medicine, Matsumoto, Japan
7. Department of Thoracic Surgery, Kyoto University Graduate School of Medicine, Kyoto, Japan
8. Department of Thoracic Surgery, Nagoya University Graduate School of Medicine, Nagoya, Japan
9. Department of Thoracic Surgery, The University of Tokyo Graduate School of Medicine, Tokyo, Japan
10. Department of General Thoracic Surgery, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Science, Okayama, Japan
11. Division of Thoracic Surgery, Department of Surgery, Keio University School of Medicine, Tokyo, Japan
12. Department of Mathematics, Science University of Tokyo, Tokyo, Japan