Department of Emergency Medicine, Wonju College of Medicine, Yonsei University, Wonju, Korea. shwang@yonsei.ac.kr. Department of Emergency Medicine, Wonju College of Medicine, Yonsei University, Wonju, Korea. Department of Emergency Medicine, Seoul National University Bundang Hospital, Seongnam, Korea. Department of Emergency Medicine, Yonsei University Kangnam Severance Hospital, Seoul, Korea. Department of Emergency Medicine, Seoul National University Boramae Hospital, Seoul, Korea. Department of Emergency Medicine, Yonsei University Severance Hospital, Seoul, Korea. Department of Emergency Medicine, Ajou University Hospital, Suwon, Korea. Department of Emergency Medicine, Asan Medical Center, Ulsan University, Seoul, Korea. Department of Emergency Medicine, Korea University Ansan Hospital, Ansan, Korea. Department of Emergency Medicine, Kyung Hee University Hospital, Seoul, Korea. Department of Emergency Medicine, Hanyang University Hospital, Seoul, Korea. Department of Emergency Medicine, Hallym University Saint Sacred Hospital, Anyang, Korea. Department of Emergency Medicine, Seoul National University Hospital, Seoul, Korea. Institute of Lifestyle Medicine, Yonsei University Wonju College of Medicine, Wonju, Korea.