1. Department of Thoracic Surgery, Saitama Cardiovascular and Respiratory Center
2. Kan-Etsu Lung Cancer Study Group (KLSG)
3. Department of Thoracic and Cardiovascular Surgery, Nara Medical University
4. Department of surgery, Teikyo University School of Medicine
5. Division of Thoracic Surgery, Department of Surgery, Keio University School of Medicine
6. Department of Thoracic Surgery, Tokyo Metropolitan Cancer and Infectious Diseases Center Komagome Hospital
7. Department of General Thoracic Surgery, Saitama Medical University International Medical Center
8. Department of Thoracic Surgery, Saitama Medical Center, Saitama Medical University
9. Division of Chest Surgery, Niigata Cancer Center Hospital
10. Department of General Thoracic Surgery, Dokkyo Medical University