CXCL13 and autoimmune encephalitis: The subgroup analysis in autoimmune encephalitis group demonstrated no significant alteration of the CXCL13 concentration with high between-study heterogeneity (SMD, 1.39; 95% CI, -0.66–3.44; P = 0.18; Q = 12.23; P < 0.01; I2 = 92%).