Association of Polymorphisms of the Matrix Metalloproteinase 9 Gene with Ischaemic Stroke in a Southern Chinese Population oleh You Li, Linfa Chen, Shaoyu Yao, Jianya Chen, Weidong Hu, Mengxu Wang, Shaofeng Chen, Xinglan Chen, Shengnan Li, Xuefeng Gu, Guoda Ma, Bin Zhao, Wangtao Zhong, Keshen Li