1. The lumbar spine and orthopedic challenge;Nachemson;Spine,1976
2. Characteristics of physician visits for back symptoms;Cypress;Am J Public Health,1983
3. Comparison of difusinal and acetaminophen with codeine in the treatment of initial or recurrent low back pain;Brown;Clin Ther,1986
4. Low back pain in the primary care setting;Barton;J Fam Pract,1976
5. The painful low back keeping it moving;Deyo;Patient Care,1987