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Frequency of rapid progression of erosion for each quartile increase of OPG/TRAIL ratio. Frequency of rapid progression of erosion (change in erosion mSharp score >5 at 2 years) in patients with rheumatoid arthritis at 2 years by baseline logarithmic ratio of quartiles of osteoprotegerin to tumor necrosis factor-related apoptosis-inducing ligand (logOPG/TRAIL) is shown
