- Correspondence to Dr S A Spencer, University Hospital of North Staffordshire NHS Trust, Neonatal Unit, Maternity Hospital, Newcastle Road, Stoke-on-Trent, Staffordshire ST4 6QG, UK;
- Received April 29, 2013
- Revised June 13, 2013
- Accepted July 3, 2013
- First published July 25, 2013.
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