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.
van Lettow M, Åkesson A, Martiniuk AL, Ramsay A, Chan AK, Anderson ST, Harries AD, Corbett E, Heyderman RS, Zachariah R, Bedell RA.van Lettow M, et al. Among authors: zachariah r.PLoS One. 2012;7(11):e48856. doi: 10.1371/journal.pone.0048856. Epub 2012 Nov 19.PLoS One. 2012.PMID: 23185278Free PMC article.