1. Division of Pulmonology, Department of Internal Medicine; Bundang CHA Hospital; Seongnam-Si Gyeonggi-Do Korea
2. Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine; Seoul National University Bundang Hospital; Seongnam-Si Gyeonggi-Do Korea
3. Department of Radiology; Seoul National University Bundang Hospital; Seongnam-Si Gyeonggi-Do Korea