Preferred reporting items for systematic reviews and meta-analyses: The PRISMA statement
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"Preferred reporting items for syste..." refers methods in this paper
...We have developed an explanatory document (18) to increase the usefulness of PRISMA....
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...In addition to the PRISMA Statement, a supporting Explanation and Elaboration document has been produced (18) following the style used for other reporting guidelines (19–21)....
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"Preferred reporting items for syste..." refers background or methods in this paper
...This information should be reported to allow an explicit assessment of the extent to which an estimate of effect is correct (38)....
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...An outcome-level assessment involves evaluating the reliability and validity of the data for each important outcome by determining the methods used to assess them in each individual study (38)....
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