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Contributors EH codesigned the survey and contributed significantly to the manuscript. LJ codesigned the survey, administered the survey via Qualtrics, analysed the data with THC and WHPH and revised the initial and subsequent manuscripts. THC and WHPH analysed the data and drafted and contributed to the manuscript. ICKW designed the survey and contributed to the manuscript.
Funding This research received no specific grant from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests None declared.
Ethics approval The survey was approved by UCL Ethics Committee.
Provenance and peer review Not commissioned; internally peer reviewed.
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