- Correspondence to Dr Malcolm Donaldson, Section of Child Health, Glasgow University School of Medicine, Glasgow G12 8 QQ, UK;
- Received 10 October 2016
- Revised 3 May 2017
- Accepted 9 May 2017
- Published in print 1 October 2017.
- Published online 20 September 2017.
- Published first 9 June 2017.
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