1. Children’s Hospital of Fudan University and the Laboratory of Neonatal Diseases of Ministry of Health, Shanghai, China;
2. Hunan Provincial Children’s Hospital, Changsha, China;
3. Hebei Provincial Children’s Hospital, Shijiazhuang, China;
4. First Hospital of Jilin University, Changchun, China;
5. Xiamen Maternity Hospital, Xiamen, China;
6. Fujian Provincial Maternity Hospital, Fuzhou, China;
7. Yuying Children’s Hospital of Wenzhou Medical College, Wenzhou, China;
8. Chenzhou Children’s Hospital, Chenzhou, China;
9. Tai’an Maternity Hospital, Tai’an, China;
10. Zhengzhou Maternity Hospital, Zhengzhou, China;
11. Ningxia Medical University Hospital, Yinchuan, China;
12. Guangxi Provincial Maternity Hospital, Nanning, China; and
13. Nanjing Children’s Hospital of Nanjing Medical University, Nanjing, China