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.
Kristiansen HA, Kværner KJ, Akre H, Øverland B, Sandvik L, Russell MB.Kristiansen HA, et al. Among authors: kvaerner kj.Cephalalgia. 2012 Apr;32(6):451-8. doi: 10.1177/0333102411431900. Epub 2011 Dec 15.Cephalalgia. 2012.PMID: 22174354
Russell MB, Kristiansen HA, Kværner KJ.Russell MB, et al. Among authors: kvaerner kj.Cephalalgia. 2014 Sep;34(10):752-5. doi: 10.1177/0333102414538551. Epub 2014 Jun 13.Cephalalgia. 2014.PMID: 24928423Review.