1. Badley EM, Rasooly I, Webster GK. Relative importance of musculoskeletal disorders as a cause of chronic health problems, disability, and health care utilization: findings from the 1990 Ontario Health Survey. J Rheumatol 1994; 21: 505–14.
2. Gabriel SE, Crowson CS, Campion ME, O’Fallon WM. Indirect and nonmedical costs among people with rheumatoid arthritis and osteoarthritis compared with nonarthritic controls. J Rheumatol 1997; 24: 43–8.
3. March LM, Bachmeier CJM. Economics of osteoarthritis: a global perspective. Baillières Clin Rheumatol 1997; 11: 817–34.
4. MacLean CH, Knight K, Paulus H, Brook RH, Shekelle PG. Costs attributable to osteoarthritis. J Rheumatol 1998; 25: 2213–8.
5. Yelin E. The economics of osteoarthritis. In Brandt KD, Doherty M, Lohmander LS, Eds. Osteoarthritis. New York: Oxford University Press, 1998: 23–30.