1. Department of Respiratory and Critical Care Medicine, The Affiliated Hospital of North Sichuan Medical College, Nanchong, Sichuan 637000, China
2. Department of Respiratory and Critical Care Medicine, Suining Central Hospital, Suining, Sichuan 629000, China
3. Department of Geriatric Medicine, Chengdu Fifth People’s Hospital, Chengdu, Sichuan 611130, China
4. Department of Gastroenterology, Anyue County People’s Hospital, Ziyang, Sichuan 642350, China
5. Department of Transfusion, Suining Central Hospital, Suining, Sichuan 629000, China
6. Institute of Rheumatology and Immunology, The Affiliated Hospital of North Sichuan Medical College, Nanchong, Sichuan 637000, China