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The name of the last author was missed from abstract number S40, Thorax 2005;60(suppl II):ii16. The correct listing of authors is: A Laverty1, P Weller2, A Jaffe1 1.Portex Respiratory Unit, Great Ormond Street Hospital for Children, London; 2. Centre for Measurement and Information in Medicine, City University, London.
The journal apologises for this error.