Simplified Perfusion Fraction from Diffusion-Weighted Imaging in Preoperative Prediction of IDH1 Mutation in WHO Grade II–III Gliomas: Comparison With Dynamic Contrast-Enhanced and Intravoxel Incoherent Motion MRI: SPF, DCE and IVIM for IDH1 Mutation. Radiol Oncol 2020, 54 (3), 301-310.