1. Department of Emergency, The First Affiliated Hospital, Guangzhou Medical University, Guangzhou, Guangdong 510120, P.R. China
2. Department of Emergency, The First Affiliated Hospital, Sun Yat‑sen University, Guangzhou, Guangdong 510080, P.R. China
3. Department of Emergency, Guangdong Provincial People's Hospital, Guangzhou, Guangdong 510080, P.R. China