1. School of Software and the Joint SDU-NTU Center for Artificial Intelligence Research (C-FAIR), Shandong University, Jinan, China
2. School of Information Science and Engineering, Shandong University, Qingdao, China
3. Department of Ultrasound, Shandong First Medical University Affiliated Provincial Hospital, Jinan, China
4. School of Engineering, Macquarie University, Sydney, NSW, Australia
5. Department of Biomedical Engineering and the Department of Computer and Data Science, Case Western Reserve University, Cleveland, OH, USA