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Article History

Received: 14 June 2018

Accepted: 9 October 2018

First Online: 23 November 2018

Ethics approval and consent to participate

: This study was granted national ethics approval. Phases 1 and 2 - Oxford Research Ethics Committee B (REC 06/Q1605/17), phase 3 - South Central – Berkshire REC (11/SC/0172). Informed written consent to participate in the study was obtained from all patients who chose to respond to a questionnaire.

: Not applicable.

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

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