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. 2022 Feb 19;30(9):3120–3130. doi: 10.1007/s00167-022-06879-7

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Fig. 2 — Risk of bias conformed by the Cochrane Handbook for Systematic Reviews of Interventions. The quality and risk of bias of individual randomised controlled trials included in the meta-analysis. D1 randomisation process, D2 Deviations from the intended interventions, D3 missing outcomes data, D4 measurement of the outcome, D5 Selection of the reported result, D6 overall