Redirect Notice
 The previous page is sending you to https://www.atsjournals.org/doi/10.1164/ajrccm.163.7.2011060?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub%20%200pubmed.

 If you do not want to visit that page, you can return to the previous page.