1. Institute of Immunology and Immunological Disease, College of Medicine, Yonsei University, Seoul, Republic of Korea
2. Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Severance Hospital, College of Medicine, Yonsei University, Seoul, Republic of Korea
3. Department of Preventive Medicine, College of Medicine, Seoul National University, Seoul, Republic of Korea
4. Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Severance Hospital, College of Medicine, Yonsei University, 50-1, Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea