1. Department of Ultrasound Medicine The Third Affiliated Hospital of Guangzhou Medical University Guangzhou China
2. Guangzhou Medical Centre for Critical Pregnant Women, Key Laboratory for Major Obstetric Disease of Guangdong Province The Third Affiliated Hospital of Guangzhou Medical University Guangzhou China
3. Medical Imaging Centre, The First Affiliated Hospital, Medical Imaging Centre, Hengyang Medical School, University of South China Hengyang China
4. Institute of Medical Imaging, University of South China Hengyang China