1. Measures of health-related quality of life and physical function;Beaton;Clin Orthop Relat Res,2003
2. A methodological framework for assessing health indices;Kirshner;J Chronic Dis,1985
3. Applying psychometric criteria to functional assessment in medical rehabilitation: II. Defining interval measures;Silverstein;Arch Phys Med Rehabil,1992
4. Validation study of WOMAC;Bellamy;J Rheumatol,1988
5. The Lower Extremity Functional Scale (LEFS): Scale development, measurement properties, and clinical application. North American Orthopaedic Rehabilitation Research Network;Binkley;Phys Ther,1999