DATA EXTRACTION: Totally 55 articles on popliteal cyst were collected, of which 24 ones were accorded with the inclusive criteria, and 31 articles were excluded.
资料提炼：共收集到有关腘窝囊肿的文献55篇。符合纳入条件的24篇，排除31篇。
DATA EXTRACTION: There were 40 literatures in accordance with the above criteria, 27 repetitive studies were excluded, and 13 were accorded with the inclusive criteria.
资料提炼：共收集到符合上述要求的文献40篇，排除27篇重复性研究，13篇符合纳入标准。
DATA EXTRACTION: Totally 71 relevant literatures were collected, 33 of which were accorded with the inclusive criteria, and the 38 repetitive ones or with old contents were excluded.
资料提炼：共收集到71篇相关文献，33篇文献符合纳入标准，排除的38篇文献为内容陈旧或重复。
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