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  • Twitter @NLeanage, @damian_roland, @TJCoats, @clifford0584

  • Contributors JDvO conducted the literature searches. JDvO, CP, NL, HT, SK, DR, TJC and TAGS selected papers and drafted the summaries.

  • Funding This study was supported by the National Institute for Health Research (JDvO receives salary funding from Doctoral Research Fellowship 300901).

  • Competing interests None declared.

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