Footnotes

• X @AHuffstetler, @kennylinafp

• Contributors RPH is a former member of the US Preventive Services Task Force and has coauthored several papers describing its methods. KWL is a former medical officer for the US Preventive Services Task Force programme at the US Agency for Healthcare Research and Quality and coauthored systematic reviews to support previous recommendation updates. RPH conceived the article. AH completed the first draft of the article. All authors participated in revising subsequent drafts. KWL is the guarantor.

• 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 None declared.

• Provenance and peer review Not commissioned; externally peer reviewed.

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