1. The European Organization for Research and Treatment of Cancer QLQ-C30: a quality-of-life instrument for use in international clinical trials in oncology;Aaronson;Journal of the National Cancer Institute,1993
2. The Sickness Impact Profile: development and final revision of a health status measure;Bergner;Medical Care,1981
3. Overview of adult health status measures fielded in Rand's health insurance study;Brook;Medical Care,1979
4. Health Status Measurement: A Perspective on Change;Brooks,1995
5. Introduction to Classical and Modern Test Theory;Crocker,1986