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.
Myreng Y, Smiseth OA.Myreng Y, et al. Among authors: smiseth oa.Circulation. 1990 Jan;81(1):260-6. doi: 10.1161/01.cir.81.1.260.Circulation. 1990.PMID: 2297830