1Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Kyung Hee University College of Medicine, Seoul, Korea.
2Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Konkuk University Medical Center, Seoul, Korea.
3Department of Clinical Pharmacology, Konkuk University Medical Center, Seoul, Korea.
4Seoul Metropolitan Government Seoul National University Boramae Medical Center, Seoul, Korea.
5Department of Internal Medicine, Hallym University Medical Center, Hallym University College of Medicine, Seoul, Korea.
6Department of Internal Medicine, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
7Department of Internal Medicine, Hanyang University Guri Hospital, Guri, Korea.
8Division of Pulmonology, Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea.
9Department of Internal Medicine, Yeouido St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
10Department of Internal Medicine, Dong-A University College of Medicine, Busan, Korea.
11Department of Internal Medicine, Inje University Seoul Paik Hospital, Seoul, Korea.
12Department of Internal Medicine, Ewha Womans University School of Medicine, Seoul, Korea.
13Division of Pulmonary Medicine, Department of Internal Medicine, Chung-Ang University School of Medicine, Seoul, Korea.
14Division of Pulmonary, Allergy and Critical Care Medicine, Department of Internal Medicine, Hallym University Sacred Heart Hospital, Anyang, Korea.
15Department of Internal Medicine, Research Institute of Clinical Medicine, Chonbuk National University Medical School, Jeonju, Korea.
16Department of Internal Medicine, Chonnam National University Hospital, Gwangju, Korea.
17Division of Pulmonology, Department of Internal Medicine, Chungnam National University College of Medicine, Daejeon, Korea.
18Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, CHA Bundang Medical Center, CHA University, Seongnam, Korea.
19Department of Internal Medicine and Environmental Health Center, Kangwon National University Hospital, Chuncheon, Korea.
20Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Inje University Ilsan Paik Hospital, Inje University College of Medicine, Goyang, Korea.
21Department of Internal Medicine, Jeju National University School of Medicine, Jeju, Korea.
22Department of Internal Medicine, Pusan National University School of Medicine, Busan, Korea.
23Division of Pulmonology, Department of Internal Medicine, Inje University Haeundae Paik Hospital, Inje University College of Medicine, Busan, Korea.
24Department of Internal Medicine, Yonsei University Wonju College of Medicine, Wonju, Korea.
25Department of Internal Medicine, Ajou University School of Medicine, Suwon, Korea.
26Regional Center for Respiratory Disease, Yeungnam University Medical Center, Yeungnam University College of Medicine, Daegu, Korea.
27Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Chungbuk National University College of Medicine, Cheongju, Korea.