- Correspondence to Linda S de Vries, Department of Neonatology, Wilhelmina Children's Hospital, University Medical Centre, Room KE 04.123.1, PO Box 85090, Utrecht 3508 AB, The Netherlands;
- Received 27 October 2012
- Revised 12 January 2013
- Accepted 19 January 2013
- Published in print 1 February 2013.
- Published online 12 February 2013.
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