- Dr C Wallis, Consultant in Paediatric Respiratory Disease, Respiratory Unit, Great Ormond Street Hospital for Children NHS Trust, London WC1N 3JH, UK.
- Received January 8, 1998
- Revision requested March 31, 1998
- Revised April 27, 1998
- Accepted May 8, 1998
- First published September 1, 1998.
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