1 Department of Emergency Medicine, Seoul Metropolitan Government-Seoul National University Boramae Medical Center, Seoul, South Korea.
2 Department of Emergency Medicine, Hanyang University College of Medicine, Seoul, South Korea.
3 Department of Emergency Medicine, University of Ulsan College of Medicine, Asan Medical Center, Seoul, South Korea.
4 Department of Emergency Medicine, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, South Korea.
5 Department of Emergency Medicine, College of Medicine, Seoul National University, Seoul, South Korea.
6 Department of Emergency Medicine, College of Medicine, Korea University, Seoul, South Korea.
7 Department of Emergency Medicine, Samsung Medical Centre, Sungkyunkwan University School of Medicine, Seoul, South Korea.
8 Department of Emergency Medicine, Samsung Medical Centre, Sungkyunkwan University School of Medicine, Seoul, South Korea. taegunshin@skku.edu.
9 Department of Emergency Medicine, CHA Bundang Medical Center, CHA University School of Medicine, Pocheon-si, Gyeonggi-Do, South Korea. dremkks@cha.ac.kr.