Received: 6 April 2017
Accepted: 25 January 2018
First Online: 12 February 2018
Ethics approval and consent to participate
: Ethical approval for the study was granted by the East of England Research Ethics Committee (Norfolk) in November 2012 (REC reference number: 12/EE/0471). Consent was obtained via signatures using detailed consent forms approved by the Ethics Committee.
: Written consent was provided, prior to interview, for the use of quotes in published material relating to the study.
: The authors declare that they have no competing interests.
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