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.
Li Z, Li FX, Byrd D, Deyhle GM, Sesser DE, Skeels MR, Lamm SH.Li Z, et al. Among authors: sesser de.J Occup Environ Med. 2000 Feb;42(2):200-5. doi: 10.1097/00043764-200002000-00020.J Occup Environ Med. 2000.PMID: 10693082Clinical Trial.