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Cochrane Collaboration’s tool for assessing the risk of bias: (1) random sequence generation; (2) allocation concealment; (3) blinding of participants and personnel; (4) blinding of outcome assessment; (5) incomplete outcome data; (6) selective reporting; and (7) other bias. (A) Risk of bias summary. (B) Risk of bias graph. (C) Quality assessment of extracted studies was performed based on the NOS. (*Represents the one criterion of each subsection was satisfied).
