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Liu, Hong-yun; Deng, You-bin; Liu, Kun; Li, Yang; Tang, Qiao-ying; Wei, Xiang; Chang, Sheng; Lu, Xia . (2013). Left ventricular systolic strain of the cardiac allograft evaluated with three-dimensional speckle tracking echocardiography. Journal of Huazhong University of Science and Technology [Medical Sciences], 33(5), 765–769. doi:10.1007/s11596-013-1194-8 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research