1. Division of Pulmonary and Critical Care Medicine; Department of Medicine; Samsung Medical Center; Sungkyunkwan University School of Medicine; Seoul
2. Department of Anesthesiology and Pain Medicine; Anesthesia and Pain Research Institute; Yonsei University College of Medicine; Seoul
3. Division of Pulmonary and Critical Care Medicine; Department of Medicine; Asan Medical Center; University of Ulsan College of Medicine; Seoul
4. Division of Pulmonary and Critical Care Medicine; Department of Medicine; Dongsan Hospital; Keimyung University; Daegu
5. Department of Anesthesiology; Aju University College of Medicine; Suwon
6. Division of Pulmonary and Critical Care Medicine; Department of Medicine; Seoul St. Mary's Hospital; Catholic University of Korea; Seoul
7. Division of Pulmonary and Critical Care Medicine; Department of Medicine; Chungju Hospital; School of Medicine of Konkuk University; Chungju
8. Division of Pulmonary, Sleep and Critical Care Medicine; Department of Medicine; Korea University Ansan Hospital; Ansan
9. Division of Pulmonary and Critical Care Medicine; Department of Medicine; Chung-Ang University College of Medicine; Seoul
10. Division of Pulmonary and Critical Care Medicine; Department of Medicine; Gangneung Asan Hospital; University of Ulsan Medical College of Medicine; Gangneung
11. Department of Pulmonary, Allergy and Critical Care Medicine; Hallym University Sacred Heart Hospital; Anyang
12. Division of Pulmonary and Critical Care Medicine; Department of Medicine; College of Medicine; Gyeongsang Institute of Health Sciences; Gyeongsang National University; Jinju
13. Division of Pulmonary and Critical Care Medicine; Department of Medicine; Ewha Womans University School of Medicine; Seoul
14. Division of Pulmonary and Critical Care Medicine; Department of Medicine; Bundang CHA hospital CHA university; Seongnam
15. Department of Multimedia; Seoul Women's University; Seoul; Korea