| Affiliation: | 1. International Healthcare Center, Soonchunhyang University Seoul Hospital, Yongsan-gu, South 2. Korea;3. Division of Pulmonology, Department of Internal Medicine, National Health Insurance Service Ilsan Hospital, Goyang, South 4. Department of Research and Analysis, National Health Insurance Service Ilsan Hospital, Goyang, South 5. Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Severance Hospital, Yonsei University College of Medicine, Seodaemun-gu, South |
