- Correspondence to Mandy Wan, National Institute for Health Research, Medicines for Children Research Network—London & South East, Guy's and St Thomas’ NHS Foundation Trust, St Thomas’ Hospital, St Thomas’ House, 5th Floor, London SE1 7EH, UK;
- Received March 9, 2013
- Revised June 6, 2013
- Accepted July 3, 2013
- First published July 29, 2013.
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