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IRT health outcomes data analysis project: an overview and summary. Quality of Life Research, 16, 121-132.
. (2007). Expansion of a physical function item bank and development of an abbreviated form for clinical research. Journal of Applied Measurement, 7, 1-15.
. (2006). Expansion of a physical function item bank and development of an abbreviated form for clinical research. Journal of Applied Measurement, 7, 1-15.
. (2006). Developing an initial physical function item bank from existing sources. Journal of Applied Measurement, 4, 124-36.
. (2003). Psychometric evaluation and calibration of health-related quality of life item banks: plans for the Patient-Reported Outcomes Measurement Information System (PROMIS). Medical Care, 45, S22-31. presented at the May.
. (2007).