- Correspondence to Dr Michael Farquhar, Department of Children's Sleep Medicine, Evelina London Children's Hospital, Guy's and St Thomas’ NHS Foundation Trust, London SE1 7EH, UK; ; @DrMikeFarquhar
- Received 20 October 2016
- Revised 21 November 2016
- Accepted 23 November 2016
- Published online 16 December 2016.
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