Flow chart of the literature search.
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A total of 1238 articles were identified from the databases, and 490 duplicates were excluded. 654 articles were excluded based on a review of the titles and abstracts, and 94 full-text articles were assessed for eligibility; 72 articles were excluded due to reasons. Finally, a total of 22 articles were included in this meta-analysis.
创建时间：
2016-02-22
