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Contributors AG, EJ and KH designed the study. EJ and KH undertook the survey, EJ and KH undertook the analysis. EJ wrote the first draft and all authors produced the final manuscript.
Funding This research was supported by the National Institute for Health Research (NIHR) Biomedical Research Centre at Guy’s and St Thomas' NHS Foundation Trust and King’s College London.
Disclaimer 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.
Provenance and peer review Not commissioned; internally peer reviewed.
Data sharing statement We are happy to share data on request.
Patient consent for publication Not required.
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