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Contributors MHM is a professor of Medicine and director of the Mayo Clinic Evidence-based Practice Centre. SS is postdoctoral research fellow at the Mayo Clinic. They both conceived the idea and critically revised and approved the manuscript. MHM is the guarantor of this work.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests MHM is a member of the GRADE Working Group and cofounder of the US GRADE Network.
Provenance and peer review Not commissioned; internally peer reviewed.