1. The epidemiology of spinal disorders.;Andersson,1997
2. Musculoskeletal conditions in the United States.;Praemer,1992
3. Low-back pain hospitalization: recent United States trends and regional variations.;Taylor;Spin,1994
4. Physician office visits for low back pain.;Hart;Spine,1995
5. Low back pain.;Frank;BMJ,1993