Table 2.

Critical Appraisal

	Hudon 2011	Köberich 2015	Brouwers 2017	Ekman 2020
Is the review question clearly and explicitly stated?	✓	✓	✓	✓
Were the inclusion criteria appropriate for the review question?	✓	✓	✓	✓
Was the search strategy appropriate?	✓	✓	✓	-
Were the sources and resources used to search for studies adequate?	✓	-	✓	✓
Were the criteria for appraising studies appropriate?	✓	-	✓	-
Was critical appraisal conducted by two or more reviewers independently?	✓	-	✓	-
Were there methods to minimize errors in data extraction?	✓	-	✓	-
Were the methods used to combine studies appropriate?	-	✓	✓	✓
Was the likelihood of publication bias assessed?a	-	-	-	-
Were recommendations for policy and/or practice supported by the reported data?	-	✓	✓	✓
Were the specific directives for new research appropriate?	✓	✓	✓	✓

^aBoth Hudon and Köberich did an extensive search for grey literature