Efficacy of Willis covered stent of intracranial pseudoaneurysms in the internal carotid artery: A systematic review and meta-analysis oleh Li Lin, Shao-Wei Xiang, Yan-Ling Sun, Yuan Chen, Zhe Wu, Zhi-Feng Ning, Ding-Wen Shen, Xue-Qin Sima, Qi-Qiang Wen, Gui-Lai Wei, Qing-Yong He