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Footnotes

  • X @J_vanOppen

  • Contributors AT, BS, CU, RC, FM, VW, JS and JDvO screened citations, selected studies for inclusion and prepared the summaries.

  • Funding This study was funded by National Institute for Health and Care Research Clinical Lectureship (James van Oppen).

  • Competing interests None declared.

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