Department of Emergency and Critical Care Medicine, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China. Department of Cardiology, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangdong Provincial Cardiovascular Institute, Guangzhou, 510080, China. Department of Critical Care Medicine, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangdong Provincial Geriatrics Institute, Guangzhou, 510080, China. Department of Emergency Medicine, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, 200233, China. Department of Respiratory and Critical Care Medicine, the First People's Hospital of Shaoguan, Shaoguan, 512000, China. Department of Emergency, the First Affiliated Hospital of Jingzhou, Jingzhou, 434000, China. Department of Gastroenterology, the First Affiliated Hospital of Yangtze University, Jingzhou, 434000, China. Department of Critical Care Medicine, Dongguan Eighth People's Hospital, Dongguan Children's Hospital, Dongguan, 523000, China. songxiuchan0769@163.com. Department of Gastroenterology, the First Affiliated Hospital of Yangtze University, Jingzhou, 434000, China. zqcn@qq.com. Department of Critical Care Medicine, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangdong Provincial Geriatrics Institute, Guangzhou, 510080, China. hdzdoctor@139.com.