1. Department of Obstetrics and Gynaecology First Affiliated Hospital of Xiamen University, School of Medicine, Xiamen University Xiamen China
2. Department of Obstetrics and Gynaecology The Chinese University of Hong Kong Hong Kong SAR
3. Collaborative Innovation Centre for Maternal and Infant Health Service Application Technology Quanzhou Medical College Quanzhou China
4. Department of Ultrasound Second Affiliated Hospital of Fujian Medical University Quanzhou China
5. Department of Pediatric Surgery First Affiliated Hospital of Xiamen University, School of Medicine, Xiamen University Xiamen China