1. BNRist, THUIBCS, BLBCI, School of Software, Tsinghua University, Beijing, China
2. Shanghai Artificial Intelligence Laboratory, Shanghai, China
3. Department of Automation, BNRist, THUIBCS, BLBCI, Tsinghua University, Beijing, China
4. Department of Ultrasound, The Second Affiliated Hospital of Xi’an Jiaotong University, Xi’an, China