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.
Richardson JE, Chatrou LW, Mols JB, Erkens RH, Pirie MD.Richardson JE, et al.Philos Trans R Soc Lond B Biol Sci. 2004 Oct 29;359(1450):1495-508. doi: 10.1098/rstb.2004.1537.Philos Trans R Soc Lond B Biol Sci. 2004.PMID: 15519968Free PMC article.
de Groot GA, During HJ, Maas JW, Schneider H, Vogel JC, Erkens RH.de Groot GA, et al.PLoS One. 2011 Jan 26;6(1):e16371. doi: 10.1371/journal.pone.0016371.PLoS One. 2011.PMID: 21298108Free PMC article.