- Dr Francjan van Spronsen, Beatrix Children's Hospital, University Medical Centre of Groningen, University of Groningen, PO Box 30.001, 9700 RB Groningen, The Netherlands;
- Received 9 October 2008
- Revised 9 October 2008
- Accepted 10 October 2008
- Published in print 1 June 2009.
- Published online 15 May 2009.
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