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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). bj03913.pdf (285.58 KB)Computerized adaptive testing and item banking. In . P. M. Fayers and R. D. Hays (Eds.) Assessing Quality of Life. Oxford: Oxford University Press.
. (2004). bj04-01.pdf (370.36 KB)