1. Department of Pediatric Hematology-Oncology, Guangzhou Women and Children’s Medical Center, Guangzhou Medical University, Guangzhou, China;
2. Department of Obstetrics and Gynecology, Shenzhen Hospital of Southern Medical University, Shenzhen, China;
3. Prenatal Diagnostic Center, Guangzhou Women and Children’s Medical Center, Guangzhou Medical University, Guangzhou, China