1. Assessment of chiropractic techniques and procedures;Cooperstein;Top Clin Chiropr,1996
2. Descriptive epidemiology of low back pain and its related medical care in the United States;Deyo;Spine,1987
3. Job analysis of chiropractic by state,1994
4. The appropriateness of spinal manipulation for low back pain;Shekelle,1991
5. The appropriateness of spinal manipulation for low back pain;Shekelle,1992