1. Beijing Key Laboratory of Function Materials for Molecule & Structure Construction, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, P. R. China
2. National-Regional
Key Technology Engineering Laboratory for Medical Ultrasound, Guangdong
Key Laboratory for Biomedical Measurements and Ultrasound Imaging,
School of Biomedical Engineering, Health Science Center, Shenzhen University, Shenzhen, Guangdong 518060, P. R. China