1. National Evidence-based Healthcare Collaborating Agency; Seoul Korea
2. Department of Information Statistics; Andong National University; Andong Korea
3. Division of Pulmonary and Critical Care Medicine; Department of Internal Medicine and Lung Institute; Seoul National University College of Medicine; Seoul Korea
4. Division of Pulmonary and Critical Care Medicine; Department of Internal Medicine and Lung Institute; Seoul National University College of Medicine; Seoul National University Bundang Hospital; Seongnam-Si Korea
5. Division of Pulmonary and Critical Care Medicine; Department of Internal Medicine; Seoul National University College of Medicine; Seoul Metropolitan Government-Seoul National University Boramae Medical Center; Seoul Korea