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.
Heinrich-Weltzien R, Kühnisch J, van der Veen M, de Josselin de Jong E, Stösser L.Heinrich-Weltzien R, et al. Among authors: kuhnisch j.Quintessence Int. 2003 Mar;34(3):181-8.Quintessence Int. 2003.PMID: 12731599