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Risk of bias assessment. Newcastle-Ottawa Scale: maximum 4 points for selection, 2 points for comparability, and 3 points for exposure/outcome. Cochrane-tool 2.0: (Q1) bias arising from the randomization process; (Q2) bias due to deviations from intended interventions; (Q3) bias due to missing outcome data; (Q4) bias in measurement of the outcome; (Q5) bias in selection of the reported result; (Q6) overall bias.
