Back to matchesWe found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleLetter to the Editor.PublicationHeadache: The Journal of Head & Face Pain, 1999, Vol 39, Issue 1, p58ISSN0017-8748Publication typeArticleDOI10.1046/j.1526-4610.1999.t01-1-3901058.x