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