1. Department of Emergency Medicine, School of Medicine, South China University of Technology, Guangzhou 510006, China; Department of Emergency Medicine, The Sixth Medical Center of PLA General Hospital of Beijing, Beijing 100048, China
2. Department of Emergency Medicine, The First Medical Center of PLA General Hospital of Beijing, Beijing 100853, China
3. Department of Emergency Medicine, The Sixth Medical Center of PLA General Hospital of Beijing, Beijing 100048, China
4. Department of Emergency Medicine, The Sixth Medical Center of PLA General Hospital of Beijing, Beijing 100048, China; Department of Emergency Medicine, School of Medicine, South China University of Technology, Guangzhou 510006, China