1. aDivision of Neonatology, Children’s Hospital of Fudan University, Shanghai, China
2. bNHC Key Laboratory of Neonatal Diseases, Fudan University, Children’s Hospital of Fudan University, Shanghai, China
3. cDepartment of Clinical Epidemiology, Children’s Hospital of Fudan University, Shanghai, China
4. dNorthwest Women’s and Children’s Hospital, The Affiliated Northwest Women’s and Children’s Hospital of ξ’an Jiaotong University, Shaanxi, China
5. eSuzhou Municipal Hospital, The Affiliated Suzhou Hospital of Nanjing Medical University, Jiangsu, China
6. fGansu Provincial Maternal and Child-care Hospital/Gansu Provincial Central Hospital, Gansu, China
7. gQingdao Women and Children’s Hospital, Qingdao University, Shandong, China
8. hDepatment of Neonatology, The Affiliated Shenzhen Maternity & Child Healthcare Hospital, Southern Medical University, Guangdong, China
9. iFujian Maternity and Child Health Hospital, College of Clinical Medicine for Obstetrics & Gynecology and Pediatrics, Fujian Medical University, Fujian, China
10. jDepartment of Pediatrics, The First Affiliated Hospital of Anhui Medical University, Anhui, China
11. kDepartment of Pediatrics, University of Toronto, Toronto, Ontario, Canada
12. lDepartment of Obstetrics and Gynecology and Dalla Lana School of Public Health, University of Toronto, Toronto, Ontario, Canada