1Department of Emergency Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
2Department of Emergency Medicine, Hallym University College of Medicine, Seoul, Korea
3Department of Emergency Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
4Department of Emergency Medicine, Seoul National University Bundang Hospital, Seongnam, Korea JFIF d d Ducky d qhttp://ns.adobe.com/xap/1.0/