1. Importance and economic burden of occupational back pain: a study of 2500 cases representative of Quebec;Abenhaim;J. Occup. Med.,1987
2. High-cost patients in a fee-for-service medical plan. The case for earlier intervention;Alexandre;Med. Care,1990
3. A prospective study of low back pain;Currey;Rheumatol. Rehabil.,1979
4. SCL-90: administration, scoring and procedures manual for the revised version, Baltimore;Derogatis;Clin. Psychomet. Res.,1977
5. Cost, controversy, crisis: low back pain and the health of the public;Deyo;Annu. Rev. Publ. Hlth,1991