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.
Haugen M, Brantsaeter AL, Trogstad L, Alexander J, Roth C, Magnus P, Meltzer HM.Haugen M, et al. Among authors: magnus p.Epidemiology. 2009 Sep;20(5):720-6. doi: 10.1097/EDE.0b013e3181a70f08.Epidemiology. 2009.PMID: 19451820
Arntzen A, Moum T, Magnus P, Bakketeig LS.Arntzen A, et al. Among authors: magnus p.Int J Epidemiol. 1996 Jun;25(3):578-84. doi: 10.1093/ije/25.3.578.Int J Epidemiol. 1996.PMID: 8671559
Samuelsen SO, Magnus P, Bakketeig LS.Samuelsen SO, et al. Among authors: magnus p.Am J Epidemiol. 1998 Nov 15;148(10):983-91. doi: 10.1093/oxfordjournals.aje.a009575.Am J Epidemiol. 1998.PMID: 9829870