Institute of Health Research

College of Medicine and Health

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© 2022 Velikova et al. This work was produced by Velikova et al. under the terms of a commissioning contract issued
by the Secretary of State for Health and Social Care. This is an Open Access publication distributed under the terms of the
Creative Commons Attribution CC BY 4.0 licence, which permits unrestricted use, distribution, reproduction and adaption in
any medium and for any purpose provided that it is properly attributed. See: https://creativecommons.org/licenses/by/4.0/.
For attribution the title, original author(s), the publication source – NIHR Journals Library, and the DOI of the publication
must be cited.
Except where otherwise noted, this item's licence is described as © 2022 Velikova et al. This work was produced by Velikova et al. under the terms of a commissioning contract issued by the Secretary of State for Health and Social Care. This is an Open Access publication distributed under the terms of the Creative Commons Attribution CC BY 4.0 licence, which permits unrestricted use, distribution, reproduction and adaption in any medium and for any purpose provided that it is properly attributed. See: https://creativecommons.org/licenses/by/4.0/. For attribution the title, original author(s), the publication source – NIHR Journals Library, and the DOI of the publication must be cited.