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Article History

Received: 12 May 2020

Revised: 28 October 2020

Accepted: 25 November 2020

First Online: 5 January 2021

Ethics approval and consent to participate

: This study was approved by the Guy’s and St Thomas’ NHS Trust Quality Improvement and Clinical Audit Committee (Number 10236) and did not require regulatory ethics approval.

: Not applicable.

: Anonymised data may be available from the corresponding author on request.

: All authors have completed the ICMJE uniform disclosure form at and declare no support from any organisation for the submitted work, no financial relationships with any organisations that might have an interest in the submitted work in the previous 3 years and no other relationships or activities that could appear to have influenced the submitted work.

: This research was supported by the South East London Cancer Alliance. The authors are responsible for study design, data collection, analysis, decision to publish and preparation of the paper. The views expressed are those of the authors and not necessarily those of the NHS or the Department of Health.