1. Department of Pediatrics and Adolescent Medicine, Turku University Hospital, Kiinamyllynkatu, Turku, Finland;
2. Department of Clinical Medicine, University of Turku, Turku, Finland;
3. National Quality Registry for Neonatal Care, Department of Pediatrics/Neonatal Services, University Hospital of Umeå, Umeå, Sweden;
4. Department of Pediatrics, University of Toronto, Toronto, Ontario, Canada;
5. Maternal-Infant Care Research Centre, and Department of Pediatrics, Mount Sinai Hospital, Toronto, Ontario, Canada;
6. United Kingdom Neonatal Collaborative, Neonatal Data Analysis Unit, and Section of Neonatal Medicine, Department of Medicine, Imperial College London, Chelsea and Westminster Hospital, London, United Kingdom;
7. Gertner Institute for Epidemiology and Health Policy Research, Sheba Medical Center, Tel Hashomer, Israel;
8. Department of Social Medicine, National Center for Child Health and Development, Tokyo, Japan
9. Maternal and Perinatal Center, Tokyo Women’s Medical University, Tokyo, Japan;
10. Royal Hospital for Women, and National Perinatal Epidemiology and Statistics Unit, University of New South Wales, Randwick, Australia;
11. Department of Pediatrics, University of Otago, Christchurch, New Zealand;
12. Department of Neonatology, University Hospital Zurich, University of Zurich, Zurich, Switzerland;
13. Health Research Institute La Fe, Avenida Fernando Abril Martorell, Valencia, Spain; and
14. TIN Toscane Online, Unit of Epidemiology, Meyer Children’s University Hospital, Florence, Italy and Regional Health Agency of Tuscany, Florence, Italy