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Article History

Received: 13 February 2019

Accepted: 2 May 2019

First Online: 29 May 2019

Competing interests

: The authors declare no conflict of interest.

: The study was approved by the South East Multi-Centre Research Ethics Committee (MREC 03/01/014) and conducted in accordance with the Declaration of Helsinki.

: No individually identifiable data is presented.

: The datasets generated during and/or analysed during the current study are not publicly available due to confidentiality reasons, but anonymised versions may be available from the corresponding author on reasonable request.

: This work was funded by Breast Cancer Now and The Institute of Cancer Research.