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Flow chart of participants in the study according to onset of RKOA and SKOA (A), knee synovitis (B), RHOA and SHOA (C), and hand synovitis (D). RKOA, radiographic knee osteoarthritis; SKOA, symptomatic knee osteoarthritis; RHOA, radiographic hand osteoarthritis; SHOA, symptomatic hand osteoarthritis.
