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.
Tambyah TA, Murphy RJ, Buenzli PR, Simpson MJ.Tambyah TA, et al. Among authors: murphy rj.Proc Math Phys Eng Sci. 2020 Nov;476(2243):20200528. doi: 10.1098/rspa.2020.0528. Epub 2020 Nov 18.Proc Math Phys Eng Sci. 2020.PMID: 33362419Free PMC article.