1. Department of Elderly Digestive, Sichuan Provincial People’s Hospital, University of Electronic Science and Technology of China, Chengdu, Sichuan Province, China
2. Department of Elderly Digestive, Chinese Academy of Sciences Sichuan Translational Medicine Research Hospital, Chengdu, Sichuan Province, China
3. Department of Emergency, People’s Hospital of Deyang City, Deyang, Sichuan Province, China
4. Department of Respiratory and Critical Care Medicine, The West China Hospital of Sichuan University, Chengdu, Sichuan Province, China