1. School of Materials Science and Engineering, Central South University, Changsha, Hunan 410083, China
2. Department of Neurology, the Second Xiangya Hospital, Central South University, Changsha 410083, China
3. Clinical Medical Research Center for Stroke Prevention and Treatment of Hunan Province, Department of Neurology, the Second Xiangya Hospital, Central South University, Changsha 410083, China