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Kwok SK, M.d. , Ph.d. .  The Baseline Serum IgG4/IgG3 Ratio Might be a Suitable Marker for Predicting Favorable Treatment Response in Patients With Idiopathic Retroperitoneal Fibrosis-associated Hydronephrosis.  J Rheum Dis 2021;28:53-54.  https://doi.org/10.4078/jrd.2021.28.2.53