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.
Larson T, Frank R, Covert D, Holub D, Morgan M.Larson T, et al.Am J Ind Med. 1980;1(3-4):449-52. doi: 10.1002/ajim.4700010323.Am J Ind Med. 1980.PMID: 7342781
Kim E, Hopke PK, Larson TV, Covert DS.Kim E, et al. Among authors: covert ds.Environ Sci Technol. 2004 Jan 1;38(1):202-9. doi: 10.1021/es030310s.Environ Sci Technol. 2004.PMID: 14740737
Koenig JQ, Pierson WE, Covert DS, Marshall SG, Morgan MS, van Belle G.Koenig JQ, et al. Among authors: covert ds.Res Rep Health Eff Inst. 1988 Jan;(14):5-24.Res Rep Health Eff Inst. 1988.PMID: 3269255