Funding for this research was provided by:
Addenbrooke's Charitable Trust, Cambridge University Hospitals (MR/K015338/1)
Received: 5 June 2020
Revised: 18 July 2020
Accepted: 20 July 2020
First Online: 30 July 2020
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: The views expressed are those of the author(s) and not necessarily those of the NHS, the NIHR or the Department of Health and Social Care.