1) Roland M, Morris R. A study of the natural history of back pain. Part I: development of a reliable and sensitive measure of disability in low-back pain. Spine. 1983; 8: 141-144.
2) Fairbank JC, Couper J, Davies JB et al. The Oswestry low back pain disability questionnaire. Physiotherapy. 1980; 66: 271-273.
3) Shirado O, Doi T, Akai M et al. An Outcome Measure for Japanese People with Chronic Low Back Pain; An Introduction and Validation Study of Japan Low Back Pain Evaluation Questionnaire (JLEQ). Spine 32, in press, 2007.