Received: 16 May 2016
Accepted: 23 January 2018
First Online: 1 February 2018
Ethics approval and consent to participate
: Joint ethical approval for the research protocol (08/H040/50) was acquired from regional Derbyshire Research Ethics Committee and Derbyshire Hospitals Research and Development office. Written, informed consent was obtained from all patients included in this study.
: Not applicable.
: All authors declare that they have no competing interests.
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