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.
Hilbert A, Vögele C, Tuschen-Caffier B, Hartmann AS.Hilbert A, et al.Physiol Behav. 2011 Oct 24;104(5):770-7. doi: 10.1016/j.physbeh.2011.07.013. Epub 2011 Aug 4.Physiol Behav. 2011.PMID: 21839762