1. Center for Prenatal Diagnosis Quanzhou Women's and Children's Hospital Quanzhou Fujian Province China
2. Department of Public Health for Women and Children Quanzhou Women's and Children's Hospital Quanzhou Fujian China
3. Prenatal Diagnosis Center Yueyang Central Hospital Yueyang China
4. Ultrasonography Quanzhou Women's and Children's Hospital Quanzhou China
5. Department of Obstetrics and Gynecology, Key Laboratory for Major Obstetric Diseases of Guangdong Province The Third Affiliated Hospital of Guangzhou Medical University Guangzhou PR China
6. Key Laboratory of Reproduction and Genetics of Guangdong Higher Education Institutes The Third Affiliated Hospital of Guangzhou Medical University Guangzhou PR China
7. Department of Neurology The Second Affiliated Hospital of Fujian Medical University Quanzhou Fujian Province PR China