Article Information
vol. 34 no. 1 56-62
PubMed
Published By
Print ISSN
Online ISSN
History
- Received December 16, 2008
- Accepted January 19, 2009
- Published online June 30, 2009.
Article Versions
- previous version (February 12, 2009 - 04:29).
- You are viewing the most recent version of this article.
Copyright & Usage
© ERS Journals Ltd
Author Information
- 1Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht, and 2Dept of Epidemiology, University Medical Center Groningen, Groningen, The Netherlands.
- R. H. H. Groenwold, Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, P.O. Box 85500, 3508 GA, Utrecht, The Netherlands. E-mail: r.h.h.groenwold{at}umcutrecht.nl