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.
Hunter MD, Eickhoff SB, Miller TW, Farrow TF, Wilkinson ID, Woodruff PW.Hunter MD, et al. Among authors: woodruff pw.Proc Natl Acad Sci U S A. 2006 Jan 3;103(1):189-94. doi: 10.1073/pnas.0506268103. Epub 2005 Dec 21.Proc Natl Acad Sci U S A. 2006.PMID: 16371474Free PMC article.