1. Emergency Department and Intensive Care Unit, West China School of Public Health, No.�4 West China Teaching Hospital, Sichuan University, Chengdu, Sichuan 610041, P.R. China
2. Geroscience and Chronic Disease Department, The 8th Municipal People's Hospital, Chengdu, Sichuan 610083, P.R. China
3. Department of Anesthesia and Intensive Care, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, P.R. China