1. Department of Emergency Medicine, College of Medicine, Hanyang University, Seoul, Korea.
2. Department of Emergency Medicine, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea.
3. Department of Emergency Medicine, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
4. Department of Emergency Medicine, CHA Bundang Medical Center, CHA University School of Medicine, Seongnam, Korea.
5. Department of Critical Care Medicine, Anyang Sam Hospital, Anyang, Korea.
6. Department of Emergency Medicine, Seoul Metropolitan Government-Seoul National University Boramae Medical Center, Seoul, Korea.
7. Department of Emergency Medicine, Seoul National University College of Medicine, Seoul, Korea.
8. Department of Emergency Medicine, College of Medicine, Korea University, Seoul, Korea.
9. Division of Pulmonary Medicine and Allergy, Department of Internal Medicine, Hanyang University College of Medicine, Seoul, Korea.
10. Department of Anesthesiology and Pain Medicine, Hanyang University Medical Center, Hanyang University College of Medicine, Seoul, Korea.
11. Department of Emergency Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.