1. Department of Thoracic, Breast and Endocrinological Surgery, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University , Okayama, Japan
2. Division of Thoracic Surgery, Department of Surgery, Kindai University Faculty of Medicine , Osaka-Sayama, Japan
3. Department of General Thoracic Surgery, Osaka University Graduate School of Medicine , Suita, Japan
4. Department of General Thoracic Surgery, Osaka International Cancer Institute , Osaka, Japan
5. Department of Thoracic Surgery, Kanagawa Cancer Center , Yokohama, Japan
6. Division of Thoracic Surgery, Department of Surgery, Jikei University School of Medicine , Tokyo, Japan
7. Department of Thoracic Surgery, Japanese Red Cross Kumamoto Hospital , Kumamoto, Japan
8. Department of Thoracic Surgery, National Cancer Center Hospital , Tokyo, Japan
9. Division of General Thoracic Surgery, Department of Surgery, School of Medicine, Keio University , Tokyo, Japan
10. Department of General Thoracic Surgery, Dokkyo Medical University , Tochigi, Japan
11. Department of Thoracic Surgery, Jichi Medical School , Tochigi, Japan
12. Department of Oncology, Immunology and Surgery, Nagoya City University Graduate School of Medical Sciences , Nagoya, Japan
13. Respiratory Disease Center, Showa University Northern Yokohama Hospital , Yokohama, Japan
14. Department of General Thoracic Surgery, Graduate School of Medicine, Chiba University , Chiba, Japan
15. Department of Mathematics, Tokyo University of Science , Tokyo, Japan
16. Department of Thoracic Surgery, Kyoto University , Kyoto, Japan