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.
Satariano WA, Ragland DR.Satariano WA, et al. Among authors: ragland dr.J Gerontol A Biol Sci Med Sci. 1996 Sep;51(5):M215-9. doi: 10.1093/gerona/51a.5.m215.J Gerontol A Biol Sci Med Sci. 1996.PMID: 8808991
Krause N, Rugulies R, Ragland DR, Syme SL.Krause N, et al. Among authors: ragland dr.Am J Ind Med. 2004 Dec;46(6):570-85. doi: 10.1002/ajim.20094.Am J Ind Med. 2004.PMID: 15551390