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PRISMA flowchart based on the following: Page, M.J.; McKenzie, J.E.; Bossuyt, P.M.; Boutron, I.; Hoffmann, T.C.; Mulrow, C.D.; et al. The PRISMA 2020 statement: An updated guideline for reporting systematic reviews [24]. * studies identified by search methods; ** studies removed because they are systematic reviews of the literature.
