1. Institute of Information Science, Beijing Jiaotong University, Beijing, China
2. School of Electrical and Information Engineering, Tianjin University, Tianjin, China
3. 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, China
4. Department of Computer Science, City University of Hong Kong, Hong Kong, SAR, China