Fig. 1From: Identifying clinical subgroups in IgG4-related disease patients using cluster analysis and IgG4-RD composite scoreThe flow scheme of statistical analysis, patients’ grouping, and comparisons among subgroups. PCA, principal components analysis; PCs, principal components; RI, IgG4-RD responder index (2012); IgG4-RD CS, IgG4-RD composite scoreBack to article page