The Dose of Intravenously Transplanted Bone Marrow Stromal Cells Determines the Therapeutic Effect on Vascular Remodeling in a Rat Model of Ischemic Stroke oleh Bin He, Qianmin Yao, Zijing Liang, Junmin Lin, Yubao Xie, Shaoming Li, Gongxiong Wu, Zhihua Yang, Pingyi Xu