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H. Paulus et al., CALCULATING ACR 20-PERCENT PRELIMINARY CRITERIA FOR IMPROVEMENT (ACR 20) IN AN EARLY RA COHORT - EQUIVALENCE OF C-REACTIVE PROTEIN (CRP), PLASMA VISCOSITY (PV), AND WESTERGREN ERYTHROCYTE SEDIMENTATION-RATE (ESR), Arthritis and rheumatism, 41(9), 1998, pp. 1151-1151