ORIGINAL ARTICLE The Eurolight project: the impact of primary headache disorders in Europe. Description of methods

The Author(s) 2011. This article is published with open access at Springerlink.com Abstract The Eurolight project is the first at European Union level to assess the impact of headache disorders, and also the first of its scale performed by collaboration between professional and lay organizations and individu-als. Here are reported the methods developed for it. The project took the form of surveys, by structured question-naire, conducted in ten countries of Europe which together represented 60 % of the adult population of the European Union. In Lithuania, the survey was population-based. Elsewhere, truly population-based studies were impractical for reasons of cost, and various compromises were developed. Closest to being population-based were th