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Article History

Received: 8 November 2017

Accepted: 19 February 2018

First Online: 16 April 2018

Ethics approval and consent to participate

: This study was approved by the University of Oxford’s central research ethics committee (CUREC reference MSD-IDREC-C1-2014-219). Informed consent was obtained from all study participants.

: Informed consent included consent for publication and dissemination of the study results, including the publication of anonymised quotations from individual survey responses.

: The author declares that she has no competing interests.

: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.