- Correspondence to Dr Ralph A H Stewart, Green Lane Cardiovascular Service, Auckland City Hospital, Park Road, Grafton, Auckland 1142, New Zealand;
- Received 26 December 2016
- Revised 12 April 2017
- Accepted 17 April 2017
- Published in print 1 December 2017.
- Published online 15 November 2017.
- Published first 26 June 2017.
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