- Correspondence to A Mellor, Cardiothoracic Outpatients, James Cook University Hospital, Middlesbrough TS4 3BW, UK;
- Received 16 January 2017
- Revision received 17 June 2017
- Accepted 19 June 2017
- Published in print 22 December 2017.
- Published online 25 December 2017.
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