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.
Græbe M, Entrekin R, Collet-Billon A, Harrison G, Sillesen H.Græbe M, et al.Ultrasound Med Biol. 2014 Jul;40(7):1641-9. doi: 10.1016/j.ultrasmedbio.2014.01.019. Epub 2014 Apr 13.Ultrasound Med Biol. 2014.PMID: 24726799