1 Department of Emergency Medicine, Taipei Veterans General Hospital, Taipei 112, Taiwan, ROC; Emergency Medicine, College of Medicine, National Yang-Ming University, Taipei 112, Taiwan, ROC.
2 Department of Emergency Medicine, Taipei Veterans General Hospital, Taipei 112, Taiwan, ROC; Emergency Medicine, College of Medicine, National Yang-Ming University, Taipei 112, Taiwan, ROC; Institute of Emergency and Critical Care Medicine, College of Medicine, National Yang-Ming University, Taipei 112, Taiwan, ROC. Electronic address: hhhuang@vghtpe.gov.tw.