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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.. (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.. (2003).
Item response theory and health outcomes measurement in the 21st century. Medical Care, 38, II28-II42.. (2000).