The 'OR' operator is used to combine synonym terms that increase search sensitivity. The 'AND' operator is used to combine the components of a research question) PICO/PECOquestion (PICO/PECO framework), this. This will limit the search and thus increase the search accuracy for retrieving related articles. It is usually not recommended not to use the 'NOT' operator. Becausebecause it may cause the loss of some related articles. But here to limit the large number of irrelevant articles and the specificity of the topic, the 'NOT' operator is used in this case. The asterisk (*) beis used to include the different search terms characters. The search string for accomplishment ofstrings to execute the searches was used in three databasedatabases: Scopus, Pubmed, and Embase, and are shown in Additional file1.

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