An official website of the United States government
The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before
sharing sensitive information, make sure you’re on a federal
government site.
The site is secure.
The https:// ensures that you are connecting to the
official website and that any information you provide is encrypted
and transmitted securely.
Wempe JB, Postma DS, Breederveld N, Kort E, van der Mark TW, Koëter GH.Wempe JB, et al. Among authors: postma ds.Thorax. 1992 Aug;47(8):616-21. doi: 10.1136/thx.47.8.616.Thorax. 1992.PMID: 1412119Free PMC article.Clinical Trial.
Auffarth B, de Monchy JG, van der Mark TW, Postma DS, Koëter GH.Auffarth B, et al. Among authors: postma ds.Thorax. 1991 Sep;46(9):638-42. doi: 10.1136/thx.46.9.638.Thorax. 1991.PMID: 1948792Free PMC article.
van der Schans CP, van der Mark TW, de Vries G, Piers DA, Beekhuis H, Dankert-Roelse JE, Postma DS, Koëter GH.van der Schans CP, et al. Among authors: postma ds.Thorax. 1991 Apr;46(4):252-6. doi: 10.1136/thx.46.4.252.Thorax. 1991.PMID: 2038733Free PMC article.