- Correspondence to:
Dr J Sunyer, Unitat de Recerca Respiratòria i Ambiental, Institut Municipal d’Investigació Médica (IMIM), Doctor Aiguader 80, E-08003 Barcelona, Catalonia, Spain;
- Accepted March 12, 2002
- Revised February 28, 2002
- First published August 1, 2002.
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