1. Department of Critical Care Medicine, The Second Affiliated Hospital of Guilin Medical University, Guilin, Guanxi 541199, P.R. China
2. Department of Geriatrics, Guangzhou First People's Hospital, Guangzhou, Guangdong 510000, P.R. China
3. Department of Emergency, TungWah Affiliated Hospital of Sun Yat‑sen University, Dongguan, Guangdong 523220, P.R. China
4. Department of Cardiovascular Medicine, TungWah Affiliated Hospital of Sun Yat‑sen University, Dongguan, Guangdong 523220, P.R. China