Quality assessment of each systematic review was conducted using the Methodological Quality Checklist (MQC) [18]. It is a 7-item scale with total scores ranging from 0 to 7. MQC evaluates strategies applied in original reviews and accounts for 7 quality criteria: (1) well-defined study participants, intervention, and outcomes; (2) search strategy is defined, combining several databases and other strategies of reference checking; (3) transparent inclusion and exclusion criteria; (4) designs of original studies and the number of studies are clarified; (5) quality assessment of original studies is included; (6) methods of data synthesis is specified and it accounts for data heterogeneity; and (7) at least 2 researchers are involved at each stage of review process. Two researchers (KH and AL) rated all systematic reviews independently. Previous umbrella reviews using MQC applied the cutoff of 4 as representing moderate or high quality [19],[20] and included research which scored ≥ 4 in MQC. Therefore, only systematic reviews scoring ≥ 4, were included into the final analyses.Because there are no widely used measures of quality evaluation of stakeholders’ documents or non-systematic reviews, we have developed a tool serving this purpose (the Methodological Quality Checklist for Stakeholder Documents and Position Papers, MQC-SP; see Additional file 1). It was based on criteria applied in MQC [18], with a 6-item scale and total scores ranging from 0 to 6. Two researchers (KH and AL) independently rated all peer-reviewed stakeholders’ documents and position review papers. Only papers scoring ≥ 4, representing moderate or high quality, were included into analyses.For all 3 types of analyzed documents the concordance of quality evaluations was high. The values of kappa coefficient were ranging from .89 (p < .01) to 1.00 (p < .001).Overall, 99 peer reviewed papers met all inclusion and exclusion criteria. They included 74 systematic reviews, 16 position papers based on a review of empirical evidence, and 9 stakeholders’ documents, published in peer-reviewed journals.
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