1. Cost-of-illness methodology: a guide to current practices and procedures;Hodgson;The Millbank Quarterly,1982
2. The state of the art of cost-of-illness estimates;Hodgson;Advances in Health Economics and Health Services Research,1983
3. Clinical Practice Guideline Number 14: Acute Low Back Problems in Adults,1994
4. Cost-Effectiveness in Health and Medicine;Gold,1996
5. Trends in disability duration and cost of workers' compensation low back pain claims (1988–1996);Hashemi;Journal of Occupational and Environmental Medicine,1998