1. Department of Diffuse Lung Diseases and Respiratory Failure, National Hospital Organization Kinki-Chuo Chest Medical Center, Japan
2. Department of Respiratory Medicine, National Hospital Organization Kinki-Chuo Chest Medical Center, Japan
3. Department of Radiology, National Hospital Organization Kinki-Chuo Chest Medical Center, Japan
4. Department of Pathology, National Hospital Organization Kinki-Chuo Chest Medical Center, Japan