- Correspondence to:
Prof. Dr J M Wit
Dept of Paediatrics, J6S, Leiden University Medical Center, PO Box 9600, 2300 RC Leiden, Netherlands;
- Accepted 5 February 2005
- Published in print 1 August 2005.
- Published online 22 July 2005.
- Published first 29 April 2005.
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