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.
Collins P, Baudo F, Huth-Kühne A, Ingerslev J, Kessler CM, Castellano ME, Shima M, St-Louis J, Lévesque H.Collins P, et al.BMC Res Notes. 2010 Jun 7;3:161. doi: 10.1186/1756-0500-3-161.BMC Res Notes. 2010.PMID: 20529258Free PMC article.