Reporting guideline for overviews of reviews of healthcare interventions: development of the PRIOR statement

To develop a reporting guideline for overviews of reviews of healthcare interventions.

Development of the preferred reporting items for overviews of reviews (PRIOR) statement.

Core team (seven individuals) led day-to-day operations, and an expert advisory group (three individuals) provided methodological advice. A panel of 100 experts (authors, editors, readers including members of the public or patients) was invited to participate in a modified Delphi exercise. 11 expert panellists (chosen on the basis of expertise, and representing relevant stakeholder groups) were invited to take part in a virtual face-to-face meeting to reach agreement (≥70%) on final checklist items. 21 authors of recently published overviews were invited to pilot test the checklist.