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Quality assessment of individual studies in the meta-analysis
Based on the quality assessment criteria, the quality of the studies was broadly subdivided into the following three categories: (A) All quality criteria were met (adequate): low risk of bias; (B) One or more of the quality criteria were only partly met (unclear): moderate risk of bias; and (C) One or more criteria were not met (inadequate or not used): high risk of bias.
Y=yes; ITT=intention-to-treat analysis.
