- Correspondence to Dr Alison Salt, Great Ormond Street Hospital for Children, Great Ormond Street, London WC1N 3JH, UK;
- Received 11 October 2016
- Revised 28 March 2017
- Accepted 4 April 2017
- Published online 30 June 2017.
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.