- Correspondence to:
Dr J Garcia-Aymerich
Respiratory and Environmental Health Research Unit, Institut Municipal d’Investigació Mèdica (IMIM), Doctor Aiguader 80, E-08003-Barcelona, Spain;
- Received 7 February 2006
- Accepted 10 May 2006
- Published in print 1 September 2006.
- Published online 25 August 2006.
- Published first 31 May 2006.
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