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I noticed that only one source was searched, Google Scholar (section 2.1 of the preprint). For a systematic review, Google Scholar is problematic, especially if it is the only source searched. See https://www.ncbi.nlm.nih.gov/pubmed/27076802.

I wonder if you asked for help from a librarian with training in systematic review searching or if sources like Cochrane handbooks were consulted for...

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methodology literature reviews systematic reviews librarians Cochrane search strategies databases database selection
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