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.
Krist AH, Woolf SH, Rothemich SF, Johnson RE, Peele JE, Cunningham TD, Longo DR, Bello GA, Matzke GR.Krist AH, et al. Among authors: matzke gr.Ann Fam Med. 2012 Jul-Aug;10(4):312-9. doi: 10.1370/afm.1383.Ann Fam Med. 2012.PMID: 22778119Free PMC article.Clinical Trial.