- Correspondence to: Dr R Boyle Paediatric Registrar, Department of Paediatrics, Pield Heath Road, Hillingdon Hospital, Uxbridge, Middlesex UB8 3NN, UK;
- Received June 2, 2002
- Accepted February 18, 2003
- Revised February 3, 2003
- First published August 2, 2004.
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