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.
Roguin A, Zviman MM, Meininger GR, Rodrigues ER, Dickfeld TM, Bluemke DA, Lardo A, Berger RD, Calkins H, Halperin HR.Roguin A, et al.Circulation. 2004 Aug 3;110(5):475-82. doi: 10.1161/01.CIR.0000137121.28722.33. Epub 2004 Jul 26.Circulation. 2004.PMID: 15277324Free PMC article.