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.
Hammar N, Kaprio J, Hagström U, Alfredsson L, Koskenvuo M, Hammar T.Hammar N, et al. Among authors: hammar t.J Epidemiol Community Health. 2002 May;56(5):362-6. doi: 10.1136/jech.56.5.362.J Epidemiol Community Health. 2002.PMID: 11964433Free PMC article.
Hammar N, Alfredsson L, Smedberg M, Ahlbom A.Hammar N, et al.Scand J Work Environ Health. 1992 Jun;18(3):178-85. doi: 10.5271/sjweh.1590.Scand J Work Environ Health. 1992.PMID: 1615292Free article.
Hammar N, Sandberg E, Ahlbom A, Alfredsson L, Leimanis A.Hammar N, et al.Lakartidningen. 1991 May 8;88(19):1770, 1775-6.Lakartidningen. 1991.PMID: 2041425Swedish.No abstract available.
Alfredsson L, Hammar N, Ahlbom A, Hogstedt C, Plato N, Smedberg M, Theorell T.Alfredsson L, et al. Among authors: hammar n.Lakartidningen. 1990 Feb 14;87(7):474-6.Lakartidningen. 1990.PMID: 2308410Swedish.No abstract available.