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.
Sacco S, Merki-Feld GS, Ægidius KL, Bitzer J, Canonico M, Kurth T, Lampl C, Lidegaard Ø, Anne MacGregor E, MaassenVanDenBrink A, Mitsikostas DD, Nappi RE, Ntaios G, Sandset PM, Martelletti P; European Headache Federation (EHF) and the European Society of Contraception and Reproductive Health (ESC).Sacco S, et al.J Headache Pain. 2017 Oct 30;18(1):108. doi: 10.1186/s10194-017-0815-1.J Headache Pain. 2017.PMID: 29086160Free PMC article.