1. Division of Thoracic Surgery, National Hospital Organization Miyakonojo Medical Center , Miyakonojo, Miyazaki , Japan
2. Division of Radiology, National Hospital Organization Miyakonojo Medical Center , Miyakonojo, Miyazaki , Japan
3. Division of Internal Medicine, National Hospital Organization Miyakonojo Medical Center , Miyakonojo, Miyazaki , Japan
4. Department of General Thoracic, Breast, and Pediatric Surgery, Faculty of Medicine, Fukuoka University , Fukuoka , Japan