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Contributors HJ drafted the manuscript and AC critically revised it.
Funding AC is supported by the National Institute for Health Research (NIHR) Oxford Health Biomedical Research Centre (grant BRC-1215-20005), by an NIHR Research Professorship (grant RP-2017-08-ST2-006) and by the NIHR Oxford Cognitive Health Clinical Research Facility.
Disclaimer The views expressed are those of the authors and not necessarily those of the UK National Health Service, the NIHR or the UK Department of Health.
Competing interests None declared.
Provenance and peer review Not commissioned; internally peer reviewed.
Patient consent for publication Not required.
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