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Twitter @PascalEdouard42, @RUNSAFE_Rasmus
Correction notice This article has been corrected since it published Online First. The title, table 1 and the conclusion have all been updated. The competing interests and provenance and peer review statements have also been corrected in the online version only.
Contributors PE: substantial contributions to the conception and design of the project, implementation of the project, data collection, analysis and interpretation of data, drafting, writing and revising of the manuscript and final approval of the version to be published. KS: substantial contributions to the analyses and interpretation of data, writing and revising of the manuscript, and final approval of the version to be published. LN: substantial contributions to interpretation of data, writing, revising of the manuscript and final approval of the version to be published. MAM: substantial contributions to the analyses and interpretation of data, writing and revising of the manuscript, and final approval of the version to be published. RON: substantial contributions to the conception and design of the manuscript, analysis and interpretation of data, drafting, writing and revising of the manuscript, and final approval of the version to be published.
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 Authors PE, KS, MAM and RON are members of the BJSM editorial board.
Provenance and peer review Not commissioned; externally peer reviewed.