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Contributors Conception/design: TY and AR. Data analysis/acquisition/interpretation: AR, TY, PD, CR and CE. Drafting/revision critically for important content: All authors. Final approval: All authors.
Funding University of Leicester authors are supported by the NIHR Leicester Biomedical Research Centre, and the NIHR Applied Research Collaborations – East Midlands (NIHR ARC – EM). The SMArT Work trial was funded by the Department of Health Policy Research Programme (project No PR-R5-0213-25004) and the SMART Work and Life trial is funded by the National Institute for Health Research Public Health Research programme (project number 16/41/04). The views expressed are those of the authors and not necessarily those of the NHS, NIHR or Department of Health. PCD is supported by a National Health and Medical Research Council of Australia Fellowship (#1142685) and the UK Medical Research Council (#MC_UU_12015/3).
Competing interests This research was supported by the NIHR Leicester Biomedical Research Centre.
Provenance and peer review Not commissioned; internally peer reviewed.