We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleCalibration of an item pool for assessing the burden of headaches: an application of item response theory to the headache impact test (HIT).AuthorsBjorner JB; Kosinski M; Ware JE JrPublicationQuality of life research : an international journal of quality of life aspects of treatment, care and rehabilitation, 2003, Vol 12, Issue 8, p913ISSN0962-9343Publication typearticleDOI10.1023/a:1026163113446