Funding for this research was provided by:
Cancer Research UK (C16077/A29186)
Article History
Received: 14 August 2020
Revised: 28 October 2020
Accepted: 5 November 2020
First Online: 30 November 2020
Ethics approval and consent to participate
: Not required as no individualised patient level data are used, and the data presented are available in the public domain.
: Not applicable.
: All the data used in this study are in the public domain and accessible at ExternalRef removed.
: The authors declare no competing interests.
: T.G. is partly funded by Cancer Research UK (C16077/A29186). All the authors are employed by NHS Trusts.