1. Department of Thoracic Surgery, Jichi Medical University, Tochigi, Japan
2. Department of Thoracic Surgery, Tokyo Medical University Hospital, Tokyo, Japan
3. Department of Thoracic Surgery, Tohoku Medical and Pharmaceutical University Hospital, Miyagi, Japan
4. Department of Thoracic Surgery, University of Tokyo Graduate School of Medicine, Tokyo, Japan
5. Department of General Thoracic Surgery, Kyorin University Hospital, Tokyo, Japan
6. Department of Thoracic Surgery, Nagoya University Graduate School of Medicine, Aichi, Japan
7. Department of General Thoracic Surgery, Dokkyo Medical University, Tochigi, Japan
8. Department of General Thoracic Surgery, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan
9. Department of Thoracic Surgery, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Japan
10. Department of Thoracic Surgery, Institute of Development, Aging and Cancer, Tohoku University, Miyagi, Japan
11. Faculty of Medicine, Department of Thoracic Surgery, University of Tsukuba, Ibaraki, Japan
12. Department of Surgical Oncology, Hiroshima University, Hiroshima, Japan
13. Department of General Thoracic Surgery, Osaka University Graduate School of Medicine, Osaka, Japan
14. Division of Thoracic Surgery, Shizuoka Hospital, Shizuoka, Japan
15. Department of Healthcare Quality Assessment, University of Tokyo Graduate School of Medicine, Tokyo, Japan