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.
Commenges D, Gagnon M, Letenneur L, Dartigues JF, Barberger-Gateau P, Salamon R.Commenges D, et al.J Nerv Ment Dis. 1992 Jan;180(1):28-32. doi: 10.1097/00005053-199201000-00007.J Nerv Ment Dis. 1992.PMID: 1538203