1. Department of Prenatal Diagnostic Center, Guangzhou Women and Children’s Medical Centre, Guangzhou Medical University, Guangzhou, People’s Republic of China;
2. State Key Laboratory of Oncology in South China, Sun Yat-sen University Cancer Center, Collaborative Innovation Center for Cancer Medicine, Guangzhou, People’s Republic of China;
3. Department of Histology and Embryology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, People’s Republic of China;
4. Department of Pediatric Surgery, Guangzhou Women and Children’s Medical Centre, Guangzhou Medical University, Guangzhou, People’s Republic of China