1. Department of Prenatal Diagnosis Laboratory, Changzhou Maternity and Child Health Hospital Affiliated to Nanjing Medical University, Changzhou, Jiangsu 213003, China
2. Department of Laboratory Medicine, Changzhou Maternity and Child Health Hospital Affiliated to Nanjing Medical University, Changzhou, Jiangsu 213003, China
3. Department of Obstetrics and Gynecology, Changzhou Maternity and Child Health Hospital Affiliated to Nanjing Medical University, Changzhou, Jiangsu 213003, China