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.
Fretheim A, Witter S, Lindahl AK, Olsen IT.Fretheim A, et al.Bull World Health Organ. 2012 Aug 1;90(8):559-559A. doi: 10.2471/BLT.12.106468.Bull World Health Organ. 2012.PMID: 22893735Free PMC article.No abstract available.
Fretheim A, Aaserud M, Oxman AD.Fretheim A, et al.PLoS Med. 2006 Jun;3(6):e216. doi: 10.1371/journal.pmed.0030216.PLoS Med. 2006.PMID: 16737349Free PMC article.