1 Department of Ultrasound, Beijing Anzhen Hospital, Capital Medical University; Beijing Key Laboratory of Maternal-Fetus Medicine in Fetal Heart Disease (BZ0308), No. 2, Anzhenli, Chaoyang District, Beijing 100029, People's Republic of China.
2 Department of Radiology, Beijing Anzhen Hospital, Capital Medical University, Beijing, People's Republic of China.
3 Department of Pathology, Beijing Anzhen Hospital, Capital Medical University, Beijing, People's Republic of China.