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.
Klipstein-Grobusch K, Grobbee DE, den Breeijen JH, Boeing H, Hofman A, Witteman JC.Klipstein-Grobusch K, et al.Am J Epidemiol. 1999 Mar 1;149(5):421-8. doi: 10.1093/oxfordjournals.aje.a009829.Am J Epidemiol. 1999.PMID: 10067901