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(a) Bar graph showing results of risk of bias (RoB) assessment obtained for the randomized controlled trials (n = 6) included in this review, using version 2 of the Cochrane risk-of-bias tool (RoB 2) [52]. (b) Bar graph showing results of quality assessment obtained for the non-randomized controlled studies (n = 64) included in this review, using the Newcastle–Ottawa Scale (NOS) tool [53,54].
