1. Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, and
2. Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea
3. Department of Radiology, Seoul National University College of Medicine, Seoul National University Hospital, Seoul, Republic of Korea;
4. Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam-si, Republic of Korea;
5. Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Seoul Metropolitan Government–Seoul National University Boramae Medical Center, Seoul, Republic of Korea; and