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.
Arulkumaran N, Turner CM, Sixma ML, Singer M, Unwin R, Tam FW.Arulkumaran N, et al. Among authors: unwin r.Front Physiol. 2013 Jul 29;4:194. doi: 10.3389/fphys.2013.00194. eCollection 2013.Front Physiol. 2013.PMID: 23908631Free PMC article.