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Contributors VM-S, RPW and CDG were involved in the writing and initial critical review of the manuscript. MSM, SRR and TP were involved in subsequent critical review.
Funding British Heart Foundation Clinical Training Fellowship awarded to Dr Williams grant number FS/11/90/29087. National Institute for Health Research (NIHR) Biomedical Research Centre based at Guy's and St Thomas’ National Health Service Foundation Trust and King's College London.
Competing interests None.
Provenance and peer review Commissioned; externally peer reviewed.
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