1. School of Computer Science, Guangdong University of Technology, Guangzhou, China
2. College of Mathematics and Informatics, South China Agricultural University, Guangzhou, China
3. National-Regional Key Technology Engineering Laboratory for Medical Ultrasound, Guangdong Key Laboratory for Biomedical Measurements and Ultrasound Imaging, School of Biomedical Engineering, Shenzhen University Medical School, Shenzhen, China