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.
Hirshberg A, Kozlovsky A, Schwartz-Arad D, Mardinger O, Kaplan I.Hirshberg A, et al.J Periodontol. 2003 Sep;74(9):1381-4. doi: 10.1902/jop.2003.74.9.1381.J Periodontol. 2003.PMID: 14584874