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Cumulative flare rate. The cumulative flare rate was compared between patients who did and did not receive HCQ in the PSL+IS, PSL, and no maintenance treatment groups by the SFI (A) and R-SFI (B). SFI: systemic lupus erythematosus flare index, R-SFI: SFI-revised, PSL: prednisolone, IS: immunosuppressant, HCQ: hydroxychloroquine, SLEDAI: Systemic Lupus Erythematosus Disease Activity Index
