- Correspondence to: Dr Matthias Kieslich, Department of Paediatrics, Paediatric Neurology, Johann Wolfgang Goethe University, Theodor-Stern-Kai 7, 60590 Frankfurt/Main, Germany;
- Received 31 October 2001
- Accepted 12 March 2002
- Revised 11 March 2002
- Published online 1 July 2002.
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