1. Genetics and Prenatal Diagnosis Center, Department of Obstetrics and Gynecology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
2. Prenatal Diagnosis Center, The 2nd Affiliated Hospital of Harbin Medical University, Harbin, China
3. Department of Obstetrics and Gynecology, The First Affiliated Hospital of Xiamen University, Xiamen, China
4. Department of Obstetrics and Gynaecology, The Chinese University of Hong Kong, Hong Kong, China
5. Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen, China