Summary of the best evidence for early pulmonary rehabilitation in patients with severe pneumonia

Clinical decision support systems are Up To Date and BMJ Best Practice; The domestic and foreign guide websites are the National Guide Network （NGC ）,the International Guide Collaboration (GIN), the JBI Evidence-based Health Care Center database, the National Institute for Health and Clinical Excellence (NICE),the Chinese Medical Assocation; Respiratory-related professional assocation (ATS), and the British Chest Assocation (BTS); The databases are PubMed, Embase, Web of Science, CINAHL , CNKI, China Biomedical Network, Wanfang, VIP, etc.