Received: 12 September 2017
Accepted: 17 January 2018
First Online: 1 February 2018
: ZL is an undergraduate medical student at The University of Birmingham undertaking this research as part of an intercalated BMedSc in public health and population sciences. SG is Professor of Medical Sociology in the Institute of Applied Health Research, University of Birmingham.
: Ethical approval for this study was granted by The University of Birmingham BMedSc Population Sciences and Humanities Internal Ethics Review Committee, reference number: Y16_C2_04_SJDL. All participants gave written informed consent.
: Participants gave written informed consent for the use of quotations for publication.
: The authors declare that they have no competing interests.
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