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.
Elmer PJ, Grimm R Jr, Laing B, Grandits G, Svendsen K, Van Heel N, Betz E, Raines J, Link M, Stamler J, et al.Elmer PJ, et al. Among authors: stamler j.Prev Med. 1995 Jul;24(4):378-88. doi: 10.1006/pmed.1995.1062.Prev Med. 1995.PMID: 7479629Clinical Trial.