1. Division of Pulmonary and Critical Care Medicine, Department of Medicine, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine , Changwon , Republic of Korea
2. Division of Pulmonary, Allergy, and Critical Care Medicine, Department of Internal Medicine, Hallym University Kangnam Sacred Heart Hospital, Hallym University College of Medicine , Seoul , Republic of Korea
3. Division of Molecular and Clinical Medicine, University of Dundee, Ninewells Hospital and Medical School , Dundee , United Kingdom
4. Department of Internal Medicine, Inje University Ilsan Paik Hospital, Inje University College of Medicine , Goyang , Republic of Korea
5. Division of Pulmonary Medicine and Allergy, Department of Internal Medicine, Hanyang University College of Medicine , Seoul , Republic of Korea
6. Department of Biostatistics, College of Medicine, Catholic University of Korea , Seoul , Republic of Korea
7. Department of Statistics and Actuarial Science, Soongsil University , Seoul , Republic of Korea
8. Department of Family Medicine/Supportive Care Center, Samsung Medical Center, Sungkyunkwan University School of Medicine , Seoul , Republic of Korea
9. Department of Clinical Research Design & Evaluation, Samsung Advanced Institute for Health Science & Technology (SAIHST), Sungkyunkwan University , Seoul , Republic of Korea