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.
Hultman CM, Sparén P, Cnattingius S.Hultman CM, et al. Among authors: sparen p.Epidemiology. 2002 Jul;13(4):417-23. doi: 10.1097/00001648-200207000-00009.Epidemiology. 2002.PMID: 12094096
Ekbom A, Richiardi L, Akre O, Montgomery SM, Sparén P.Ekbom A, et al. Among authors: sparen p.J Natl Cancer Inst. 2003 Aug 20;95(16):1238-40. doi: 10.1093/jnci/djg012.J Natl Cancer Inst. 2003.PMID: 12928349
Melin A, Sparén P, Persson I, Bergqvist A.Melin A, et al. Among authors: sparen p.Hum Reprod. 2006 May;21(5):1237-42. doi: 10.1093/humrep/dei462. Epub 2006 Jan 23.Hum Reprod. 2006.PMID: 16431901