1. Prenatal Diagnosis Center, Meizhou People's Hospital (Huangtang Hospital) Meizhou Hospital Affiliated to Sun Yat‐sen University Meizhou China
2. Department of Obstetrics, Meizhou People's Hospital (Huangtang Hospital) Meizhou Hospital Affiliated to Sun Yat‐sen University Meizhou China
3. Guangdong Provincial Key Laboratory of Precision Medicine and Clinical Translational Research of Hakka Population, Meizhou People's Hospital (Huangtang Hospital), Meizhou Academy of Medical Sciences Meizhou Hospital Affiliated to Sun Yat‐sen University Meizhou China
4. Ultrasonic Department, Meizhou People's Hospital (Huangtang Hospital) Meizhou Hospital Affiliated to Sun Yat‐sen University Meizhou China