Institute of Health Research

Collections of Former Colleges

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© Authors 2019. Reuse of this manuscript version (excluding any databases, tables, diagrams, photographs and other images or illustrative material included where a another copyright owner is identified) is permitted strictly pursuant to the terms of the Creative Commons Attribution-Non Commercial 4.0 International (CC-BY-NC 4.0). https://creativecommons.org/licenses/by-nc/4.0/. No commercial re-use. See rights and permissions. Published by BMJ.
Except where otherwise noted, this item's licence is described as © Authors 2019. Reuse of this manuscript version (excluding any databases, tables, diagrams, photographs and other images or illustrative material included where a another copyright owner is identified) is permitted strictly pursuant to the terms of the Creative Commons Attribution-Non Commercial 4.0 International (CC-BY-NC 4.0). https://creativecommons.org/licenses/by-nc/4.0/. No commercial re-use. See rights and permissions. Published by BMJ.