About the Authors

Kyung Soo Chung

Affiliation Division of Pulmonology, Department of Internal Medicine, Institute of Chest Disease, Severance Hospital, Yonsei University College of Medicine, Seoul, Republic of Korea

Young Sam Kim

Affiliation Division of Pulmonology, Department of Internal Medicine, Institute of Chest Disease, Severance Hospital, Yonsei University College of Medicine, Seoul, Republic of Korea

Se Kyu Kim

Affiliation Division of Pulmonology, Department of Internal Medicine, Institute of Chest Disease, Severance Hospital, Yonsei University College of Medicine, Seoul, Republic of Korea

Ha Yan Kim

Affiliation Biostatistics Collaboration Unit, Yonsei University College of Medicine, Seoul, Republic of Korea

Sang Min Lee

Affiliation Department of Radiology & Research Institute of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea

Joon Beom Seo

Affiliation Department of Radiology & Research Institute of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea

Yeon Mok Oh

Affiliation Department of Pulmonary and Critical Care Medicine and Clinical Research Center for Chronic Obstructive Airway Diseases, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea

Ji Ye Jung

Contributed equally to this work with: Ji Ye Jung, Sang-Do Lee

stopyes@yuhs.ac (JYJ); sdlee@amc.seoul.kr (SDL)

Affiliation Division of Pulmonology, Department of Internal Medicine, Institute of Chest Disease, Severance Hospital, Yonsei University College of Medicine, Seoul, Republic of Korea

Sang-Do Lee

Contributed equally to this work with: Ji Ye Jung, Sang-Do Lee

stopyes@yuhs.ac (JYJ); sdlee@amc.seoul.kr (SDL)

Affiliation Department of Pulmonary and Critical Care Medicine and Clinical Research Center for Chronic Obstructive Airway Diseases, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea

Korean Obstructive Lung Disease study group

Membership of the Korean Obstructive Lung Disease is provided in the Acknowledgments.

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: YSK SKK YMO SDL. Analyzed the data: HYK. Contributed reagents/materials/analysis tools: SML JBS. Wrote the paper: KSC JYJ.