1. Japanese Association for Chest Surgery , Kyoto, Japan
2. Department of Thoracic Surgical Oncology, Cancer Institute Hospital of Japanese Foundation for Cancer Research , Tokyo, Japan
3. Department of Healthcare Quality Assessment, Graduate School of Medicine, The University of Tokyo , Tokyo, Japan
4. Division of Thoracic Surgery, National Cancer Centre Hospital East , Chiba, Japan
5. Department of Thoracic Surgery and Thyroid Surgery, Kyorin University School of Medicine , Tokyo, Japan
6. Faculty of Medicine, Department of Thoracic Surgery, University of Tsukuba , Ibaraki, Japan
7. Department of General Thoracic Surgery, Juntendo University School of Medicine , Tokyo, Japan
8. Department of General Thoracic Surgery, Dokkyo Medical University , Tochigi, Japan