CXCL10 and tuberculosis: Heterogeneity was not detected with respect to TB high-burden versus TB low-burden countries (P = 0.83), cohort versus other study design types (P = 0.55), adults versus children (with or without adults) (P = 0.59), multiplex cytokine assay versus ELISA to detect IP-10 (P = 0.73), IP-10 stimulation or not (P = 0.72), and HIV infection or not (P = 0.53).