1. Department of Children Health Care, Guangzhou Institute of Pediatrics, Guangzhou Women and Children's Medical CenterGuangzhou Medical University Guangzhou China
2. Division of Uterine Vascular Biology, Guangzhou Institute of Pediatrics, Guangzhou Women and Children's Medical CenterGuangzhou Medical University Guangzhou China
3. Department of Obstetrics, Guangzhou Institute of Pediatrics, Guangzhou Women and Children's Medical CenterGuangzhou Medical University Guangzhou China
4. Virus Laboratory, Guangzhou Institute of Pediatrics, Guangzhou Women and Children's Medical CenterGuangzhou Medical University Guangzhou China