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Twitter @peanutbuttner, @marinuswinters, @EamonnDelahunt, @clare_ardern
Contributors MW and CLA conceived the original idea. FCB, MW, ED, and CLA developed the original idea. FCB composed the initial manuscript draft. MW, ED, and CLA provided comments on and contributed towards the writing of the initial manuscript draft. FCB, MW, ED, RE, CBL, KMK, AW, and CLA provided comments on and contributed towards the writing and editing of the final manuscript draft.
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 Karim M Khan is BJSM Editor-in-Chief. Adam Weir is a BJSM Deputy Editor. Eamonn Delahunt and Marinus Winters are BJSM Senior Associate Editors. Clare L Ardern was a BJSM Deputy Editor until July 2018. Roy Elbers is a member of the ROB2 Development Group.
Patient consent for publication Not required.
Provenance and peer review Not commissioned; externally peer reviewed.
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