DATA EXTRACTION: Totally 589 relevant literatures were collected, and 20 of them were in accordance with the inclusive criteria.
资料提炼：共收集到589篇与人工膝关节置换术相关的文献，其中20篇符合纳入标准。
DATA EXTRACTION: Totally 45 articles about osteoporosis and COPD were collected, 36 of them were in accordance with the inclusive criteria.
资料提炼：共收集到45篇有关慢性阻塞性呼吸系统疾病和骨质疏松症关系的文章，其中36篇符合纳入标准。
DATA EXTRACTION: a total of 35 articles related to the common complications of stroke were collected, 18 of which were in accordance with the inclusive criteria.
资料提炼：共收集到35篇关于脑卒中后常见并发症的相关文献，18个试验符合纳入标准。
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