Quantitative assessment of the microstructure of the mesorectum with different prognostic statuses by intravoxel incoherent motion diffusion-weighed magnetic resonance imaging oleh Bao-Lan Lu, Yan Chen, Zi-Qiang Wen, Yi-Yan Liu, Yu-Ru Ma, Yu-Tao Que, Zhi-Wen Zhang, Xue-Han Wu, Shen-Ping Yu