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Evaluating associations of joint swelling, joint stiffness and joint pain with physical activity in first-degree relatives of patients with rheumatoid arthritis: Studies of the Aetiology of Rheumatoid Arthritis (SERA), a prospective cohort study

oleh: Michael H Weisman, Joachim H Ix, Jill M Norris, James R ODell, Ted R Mikuls, Kevin D Deane, V Michael Holers, M Kristen Demoruelle, Jane H Buckner, Richard M Keating, Jan M Hughes-Austin, Samuel R Ward