Yuhua Jiang1, Jing Luo1, Jingchen Zheng2, Youxiang Li1. 1. Department of Interventional Neuroradiology, Beijing Neurosurgical Institute and Beijing Tiantan Hospital, Capital Medical University, Beijing, China. 2. Institute of Disaster Relief Medical Science, The General Hospital of the Chinese People's Armed Police Forces, Beijing, China jingchenzheng@126.com liyouxiang@263.net.