Cortical Venous Changes on Susceptibility-Weighted Imaging Predict the Cerebral Collateral Circulation as Confirmed by Digital Subtraction Angiography oleh Yun-Hao Zhan, Yang-Kun Chen, Run-Xiong Li, Gen-Pei Luo, Zhi-Qiang Wu, Yong-Lin Liu, Wei-Min Xiao, Wei-Dong Hu, Cai-Qin Xie