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.
Sigfússon N, Sigurðsson G, Sigvaldason H, Guðnason V.Sigfússon N, et al.Laeknabladid. 2003 Jun;89(6):489-98.Laeknabladid. 2003.PMID: 16940595Icelandic.
Sigfússon N, Sigurðsson G, Agnarsson U, Guðmundsdóttir II, Stefánsdóttir I, Sigvaldason H, Guðnason V.Sigfússon N, et al.Laeknabladid. 2001 Nov;87(11):889-96.Laeknabladid. 2001.PMID: 17019017Icelandic.
Sigfusson N, Sigurdsson G, Agnarsson U, Gudmundsdottir II, Stefansdottir I, Sigvaldason H, Gudnason V.Sigfusson N, et al.Scand Cardiovasc J. 2002 Dec;36(6):337-41. doi: 10.1080/140174302762659049.Scand Cardiovasc J. 2002.PMID: 12626199Free article.
Sigfusson N, Sigvaldason H, Steingrimsdottir L, Gudmundsdottir II, Stefansdottir I, Thorsteinsson T, Sigurdsson G.Sigfusson N, et al.BMJ. 1991 Jun 8;302(6789):1371-5. doi: 10.1136/bmj.302.6789.1371.BMJ. 1991.PMID: 2059715Free PMC article.