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.
Dempsey JP, Cole DM, Wang S.Dempsey JP, et al.Philos Trans A Math Phys Eng Sci. 2018 Sep 28;376(2129):20170346. doi: 10.1098/rsta.2017.0346.Philos Trans A Math Phys Eng Sci. 2018.PMID: 30126917Free PMC article.