1. Department of Pulmonary and Critical Care Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
2. Department of Internal Medicine, Pusan National University Yangsan Hospital, Yangsan, Republic of Korea
3. Department of Chest Medicine, Masan National Tuberculosis Hospital, Masan, Republic of Korea
4. Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea