1. Division of Thoracic Surgery, Department of Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan;
2. General Thoracic Surgery, Nara Hospital, Kindai University School of Medicine, Osaka, Japan;
3. Department of General Thoracic Surgery, Osaka University Graduate School of Medicine, Osaka, Japan;
4. Department of Chest Surgery, Osaka Police Hospital, Osaka, Japan;
5. Department of General Thoracic Surgery, Osaka International Cancer Institute, Osaka, Japan;
6. Department of General Thoracic Surgery, Toneyama National Hospital, Osaka, Japan