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Contributors LP and SH drafted the manuscript. NI, DN, NP and LC provided input. All authors edited and reviewed the final version.
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 NI is employed by the Stormers and Western Province Rugby Union. DN, NP and LC are employed by the South African Rugby Union. SH is a member of the BJSM Editorial Board.
Provenance and peer review Not commissioned; externally peer reviewed.