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.
Persson LG, Hjalmarson A.Persson LG, et al.Scand J Prim Health Care. 2006 Jun;24(2):75-80. doi: 10.1080/02813430500439395.Scand J Prim Health Care. 2006.PMID: 16690554Clinical Trial.
Hjalmarson A, Saloojee Y.Hjalmarson A, et al.Prev Med. 2005 Jul;41(1):291-4. doi: 10.1016/j.ypmed.2004.11.012. Epub 2004 Dec 29.Prev Med. 2005.PMID: 15917024