Correspondence to Dr Phathokuhle Cele Zondi, High Performance Commission, Medical Advisory Committee, South African Sports Confederation and Olympic Committee, Houghton 4409, South Africa; ...

Correspondence to Dr Parco M Siu, The University of Hong Kong, Hong Kong, 999077, Hong Kong; pmsiu{at}hku.hk Data sources Embase, MEDLINE, PsycINFO, Cochrane Library, Web of Science, Scopus and ...

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