1. Back pain;Belkin,1992
2. Chronic low back pain: avoiding common;Boden,1992
3. Occupational back pain—an unhelpful polemic;Frank;Scand. J. Work, Environ. Health,1995
4. Medical, psychological and social factors associated with back abnormalities and self reported back pain: a cross-sectional study of male employees in a Swedish pulp and paper industry;Astrand;Br. J. Ind. Med.,1987
5. Socioeconomic influences on back problems in the community in Britain;Croft;J. Epidemiol. Community Health,1994