CRP and immunoglobulin G4-related sclerosing disease: The extracted data included the following items: first author, year of publication, study design, country, mean follow-up, number of patients, sex, mean age of patients, interventions, dose of GC, types of IM, predominant organ involvement, IgG4-RD responder index (RI), risks of relapse, number of organs involved, duration of disease, blood tests (including eosinophils, erythrocyte sedimentation rate (ESR), c-reactive protein (CRP), and IgE), relapse rate, remission rate, and adverse events.