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, Alfredsson L, Smedberg M, Ahlbom A.Hammar N, et al. Among authors: alfredsson l.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, Ahlbom A, Sandberg E, Alfredsson L.Hammar N, et al. Among authors: alfredsson l.Epidemiology. 1996 Nov;7(6):654-5.Epidemiology. 1996.PMID: 8899399No abstract available.
Hammar N, Alfredsson L, Johnson JV.Hammar N, et al. Among authors: alfredsson l.Occup Environ Med. 1998 Aug;55(8):548-53. doi: 10.1136/oem.55.8.548.Occup Environ Med. 1998.PMID: 9849542Free PMC article.