1. Department of Ultrasound (B.W., W.G., Y.L., L.Z., M.X.), Wuhan, China.
2. Union Hospital, Tongji Medical College, Huazhong University of Science and Technology and Hubei Province Key Laboratory of Molecular Imaging (B.W., W.G., Y.L., L.Z., M.X.), Wuhan, China.
3. Department of Cardiovascular Surgery (N.D), Wuhan, China.