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It does not involve the collection, use, or analysis of any new individual-level human data. As such, ethical approval from an Institutional Review Board (IRB) or Ethics Committee was not required. All primary studies included stated that they had obtained the appropriate ethics approval and participant consent according to their respective institutional standards.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Human ethics approval"}},{"value":"This study is a systematic review and meta-analysis based exclusively on previously published data. Therefore, it did not require institutional review board (IRB) approval or informed consent. 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