1. Department of Information ManagementMaternal and Child Health Hospital of Hunan Province Changsha Hunan China
2. NHC Key Laboratory of Birth Defect for Research and PreventionHunan Provincial Maternal and Child Health Care Hospital Changsha Hunan China
3. Department of Health Care ManagementMaternal and Children Hospital of Hunan Province Changsha Hunan China
4. Department of Clinical LaboratoryMaternal and Child Health Hospital of Hunan Province Changsha Hunan China
5. Department of Obstetrics and GynecologyShunde Hospital of Southern Medical University Foshan City Guangdong Province China