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.
Barry E, O'Brien K, Moriarty F, Cooper J, Redmond P, Hughes CM, Bennett K, Fahey T, Smith SM; PIPc Project Steering group.Barry E, et al. Among authors: moriarty f.BMJ Open. 2016 Sep 6;6(9):e012079. doi: 10.1136/bmjopen-2016-012079.BMJ Open. 2016.PMID: 27601499Free PMC article.