1. Department of Forensic Medicine; Zhongshan School of Medicine, Sun Yat-sen University; Guangzhou China
2. Department of Gynaecology; Third Affiliated Hospital of Sun Yat-sen University; Guangzhou China
3. Fetal Medicine Center, Department of Obstetrics and Gynecology; First Affiliated Hospital of Sun Yat-sen University; Guangzhou China
4. Reproductive Medicine Center; First Affiliated Hospital of Sun Yat-sen University; Guangzhou China