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Kim SH, M.d. , Ph.d. , Jeong HJ, M.d. , Kim JM, M.d. , Ph.d. , Jun JB, M.d. , Ph.d. , Son CN, M.d. , Ph.d. .  Clinical Significance of Elevated Serum Immunoglobulin G4 Levels in Patients With Rheumatoid Arthritis.  J Rheum Dis 2020;27:96-99.  https://doi.org/10.4078/jrd.2020.27.2.96