1. Prenatal Diagnosis Center in Guizhou Province The Affiliated Hospital of Guizhou Medical University Guiyang China
2. School of Medical Laboratory Guizhou Medical University Guiyang China
3. School of Public Health Key Laboratory of Environmental Pollution Monitoring and Disease Control Guizhou Medical University Guiyang China
4. Department of Obstetrics and Gynecology The Affiliated Hospital of Guizhou Medical University Guiyang China