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.
Froehling DA, Silverstein MD, Mohr DN, Beatty CW, Offord KP, Ballard DJ.Froehling DA, et al. Among authors: silverstein md.Mayo Clin Proc. 1991 Jun;66(6):596-601. doi: 10.1016/s0025-6196(12)60518-7.Mayo Clin Proc. 1991.PMID: 2046397