Back to matchesWe found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleLetters To the Editor.PublicationHeadache: The Journal of Head & Face Pain, 1964, Vol 3, Issue 4, p159ISSN0017-8748Publication typeArticleDOI10.1111/j.1526-4610.1964.hed0304159.x