We will search 4 English electronic databases and 3 Chinese literature databases for studies published before November 29th, 2020: PubMed, Excerpta Medica Database, Cochrane Library, Web of Science, Wanfang Database, SINOMED, China Science and Technology Journal Database, and China National Knowledge Infrastructure. And there is no restriction for language. Take PubMed as an example, and details of search strategy are shown in Table Table1.1. Moreover, manual retrieval will be performed on baidu academic, Google academic, books, impurities, and conference materials in order to obtain all the materials related to this study as comprehensively as possible. This work will be completed by 2 independent reviewers and, in cases where they have a disagreement, a third person will be asked for advice.

Search strategy in PubMed database.

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