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.
Ahlskog JE, Kelly PJ, van Heerden JA, Stoddard SL, Tyce GM, Windebank AJ, Bailey PA, Bell GN, Blexrud MD, Carmichael SW.Ahlskog JE, et al.Mayo Clin Proc. 1990 Mar;65(3):305-28. doi: 10.1016/s0025-6196(12)62532-4.Mayo Clin Proc. 1990.PMID: 2314121