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2 “Physical exercise and risk of severe knee osteoarthritis requiring arthroplasty.” P. Manninen, H. Riihimäki1, M. Heliövaara2 and O. Suomalainen3 Rheumatology 2001; 40: 432-437 © 2001 British Society for Rheumatology
3 Yu B, Gross MT, Jonas BL, et al. Early intervention of knee osteoarthritis. The Center for Human Movement Science at the University of North Carolina, Chapel Hill. (See: http://www.med.unc.edu/chms/ProjectsKOA.htm)
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6 National Center for Chronic Disease Prevention and Health Promotion, NHIS Arthritis Surveillance (See: http://www.cdc.gov/arthritis/data_statistics/national_data_nhis_htm#future)
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