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). ![application/pdf PDF icon](/modules/file/icons/application-pdf.png)
Dynamic health assessments: The search for more practical and more precise outcomes measures. Quality of Life Newsletter, 11-13.
. (1999). ![application/pdf PDF icon](/modules/file/icons/application-pdf.png)
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).