We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleSferics and headache: a prospective study.AuthorsWalach, H; Betz, H-D; Schweickhardt, APublicationCephalalgia, 2001, Vol 21, Issue 6, p685ISSN0333-1024Publication typearticleDOI10.1046/j.1468-2982.2001.00230.x