1. Department of Cardiology, Second Affiliated Hospital of Chongqing Medical University, Chongqing 400010, P. R. China
2. Institute of Ultrasound Imaging, Chongqing Key Laboratory of Ultrasound Molecular Imaging, The Second Affiliated Hospital of Chongqing Medical University, Chongqing 400010, P. R. China
3. Department of Physiology, Cardiovascular Research Institute Maastricht, Maastricht University, P.O. Box 616, 6200 MD, Maastricht, The Netherlands
4. Department of Biochemistry, Cardiovascular Research Institute Maastricht, University of Maastricht, P.O. Box 616, 6200 MD, Maastricht, The Netherlands