1. Department of Radiology, School of Medicine, Ewha Womans University, Seoul 07985, Korea.
2. Division of Pulmonology and Critical Care Medicine in Department of Internal Medicine, School of Medicine, Ewha Womans University, Seoul 07985, Korea.
3. Department of Thoracic and Cardiovascular Surgery, School of Medicine, Ewha Womans University, Seoul 07985, Korea.
4. Department of Pathology, School of Medicine, Ewha Womans University, Seoul 07985, Korea.