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Forest plots of skin reaction, flu-like syndrome, and gastrointestinal symptoms after vaccination of glioma patients. (A) Meta-analysis of skin reaction (RR = 3.654; 95% CI: 1.711–7.801), (B) Meta-analysis of flu-like syndrome (RR = 5.21, 95% CI: 2.691–10.086), and (C) Meta-analysis of lymphopenia (RR = 21.962, 95% CI: 0.322–1497.67). For all the analyses, the significance level of p ≤ 0.05 was considered.
