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. (2003). Calibration of an item pool for assessing the burden of headaches: an application of item response theory to the Headache Impact Test (HIT). Quality of Life Research, 12, 913-933.
bj03913.pdf (285.58 KB). (2003). The feasibility of applying item response theory to measures of migraine impact: a re-analysis of three clinical studies. Quality of Life Research, 12, 887-902.