- Correspondence to Dr Michael Joseph Barrett, Department of Neonatology, National Maternity Hospital, Holles Street, Dublin 2, Ireland;
- Received 7 December 2011
- Revised 5 June 2012
- Accepted 18 June 2012
- Published in print 1 March 2013.
- Published online 15 February 2013.
- Published first 19 July 2012.
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