Open Access Published: June 2001 On the web The Journal of Headache and Pain volume 2, page49(2001)Cite this article 223 Accesses 2 Citations Rights and permissionsReprints and PermissionsAbout this articleCite this article On the web. J Headache Pain 2, 49 (2001). https://doi.org/10.1007/PL00012187Download citationIssue Date: June 2001DOI: https://doi.org/10.1007/PL00012187 Comments By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate. Please note that comments may be removed without notice if they are flagged by another user or do not comply with our community guidelines.