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Article History

Received: 19 February 2018

Accepted: 4 July 2018

First Online: 11 July 2018

Ethics approval and consent to participate

: Ethics approval was given by the University of Manchester research ethics committee in March 2015. Participants were provided with written information about the study, and gave written consent, or for telephone interviews gave consent verbally at the beginning of the interview.

: Participants gave consent for publication of anonymised quotes from their interview transcripts.

: The authors declare that they have no competing interests.

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