Sources
National Institutes of Health, NIH Senior Health
The Arthritis Foundation
American College of Rheumatology
American Academy of Orthopaedic Surgeons
National Institutes of Arthritis and Musculoskeltal Diseases; NIH Senior Health. Arthritis Defined - Rheumatoid Arthritis. August 15, 2006.
National Institutes of Arthritis and Musculoskeltal Diseases; NIH Senior Health. Arthritis Defined - Osteoarthritis. August 15, 2006.
National Institutes of Arthritis and Musculoskeltal Diseases; NIH Senior Health. Causes and Risk Factors - Rheumatoid Arthritis. August 15, 2006.
National Institutes of Arthritis and Musculoskeltal Diseases; NIH Senior Health. Causes and Risk Factors - Osteoarthritis. August 15, 2006.
In the Encyclopedia: Seniors' health Ankylosing spondylitis Antinuclear antibody test
This article was reviewed and updated June 2007.
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