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Contributors All authors (JA-T, JMV, FGB and JA) were involved in all phases of the development of this manuscript, from the initial idea to the review and acceptance of the final draft for submission.
Funding The present work is partially funded by the Medical Research Council (MR/S028188/1). This article represents independent research part funded by the National Institute for Health Research (NIHR) Biomedical Research Centre at South London and Maudsley NHS Foundation Trust and King’s College London. The views expressed are those of the authors and not necessarily those of the NHS, the NIHR or the Department of Health.
Competing interests None declared.
Patient consent for publication Not required.
Provenance and peer review Not commissioned; externally peer reviewed.