Funding for this research was provided by:
Scottish Government
Article History
Received: 24 March 2018
Accepted: 17 August 2018
First Online: 28 August 2018
Ethics approval and consent to participate
: Ethics approval was granted by the University of Edinburgh Centre for Population Health Sciences Research Ethics Committee and complied with research governance procedures in both study sites. Written consent was obtained from all participants prior to data collection.
: Not applicable.
: The authors declare that they have no competing interests.
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