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.
Smith DR, Leggat PA.Smith DR, et al.J Occup Environ Med. 2007 Apr;49(4):437-45. doi: 10.1097/JOM.0b013e3180430134.J Occup Environ Med. 2007.PMID: 17426527
Smith DR, Leggat PA.Smith DR, et al.BMC Public Health. 2007 Jun 20;7:115. doi: 10.1186/1471-2458-7-115.BMC Public Health. 2007.PMID: 17578582Free PMC article.Review.