1. Department of Ultrasonic Medicine West China Second University Hospital of Sichuan University Chengdu Sichuan China
2. Key Laboratory of Birth Defects and Related Diseases of Women and Children (Sichuan University) Ministry of Education Chengdu Sichuan China
3. Department of Pediatrics West China Second University Hospital of Sichuan University Chengdu Sichuan China
4. Department of Obstetrics West China Second University Hospital of Sichuan University Chengdu Sichuan China
5. Department of Radiology West China Second University Hospital of Sichuan University Chengdu Sichuan China