Perfusion magnetic resonance imaging in the differentiation between glioma recurrence and pseudoprogression: a systematic review, meta-analysis and meta-regression - Zhang, Jun; Wang, Yulin; Wang, Yan; Xiao, Huafeng; Chen, Xinjing; Lei, Yifei; Feng, Zhebin; Ma, Xiaodong; Ma, Lin (Quantitative Imaging in Medicine and Surgery, 2022)