Funding for this research was provided by:
MRC Centre Grant (Mr/N022556/1)
Received: 27 September 2017
Accepted: 18 April 2018
First Online: 25 April 2018
Ethics approval and consent to participate
: Ethical approval has been obtained from the Scotland A Research Ethics Committee (LREC 16/SS/0010). All participants consented and agreed to take part in the study.
: The authors declare that they have no competing interests.
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