1. Department of Computer Science and Technology, Tsinghua University, Beijing, China
2. Echocardiography Medical Center, Beijing Anzhen Hospital, Capital Medical University Maternal-Fetal Medicine Center in Fetal Heart Disease, Beijing, China
3. School of Artificial Intelligence, University of Chinese Academy of Sciences, Beijing, China
4. State Key Laboratory of Management and Control for Complex Systems, Institute of Automation, Chinese Academy of Sciences, Beijing, China