1. Xiamen Key Laboratory of Basic and Clinical Research on Major Obstetrical Diseases, Women and Children’s Hospital, School of Medicine, Xiamen University, Xiamen, China
2. Medical College, Nanchang Institute of Technology, Nanchang, China
3. Xiamen Clinical Research Center for Perinatal Medicine, Women and Children’s Hospital, School of Medicine, Xiamen University, Xiamen, China
4. Department of Ultrasound, Women and Children’s Hospital, School of Medicine, Xiamen University, Xiamen, China
5. Department of Obstetrics, Women and Children’s Hospital, School of Medicine, Xiamen University, Xiamen, China.