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.
Cooper A, Timmis A, Skinner J; Guideline Development Group.Cooper A, et al. Among authors: timmis a.BMJ. 2010 Mar 24;340:c1118. doi: 10.1136/bmj.c1118.BMJ. 2010.PMID: 20335334No abstract available.