1. Department of Clinical Science, Intervention, and Technology, Karolinska Institutet, Stockholm, Sweden
2. Department of Neonatal Medicine, Karolinska University Hospital, Stockholm, Sweden
3. The Swedish Neonatal Quality Register, Stockholm, Sweden
4. Clinical Epidemiology Division, Department of Medicine, Solna, Karolinska Institutet, Stockholm, Sweden
5. Department of Women’s Health, Karolinska University Hospital, Stockholm, Sweden
6. Division of Infectious Diseases, Department of Medicine, Solna, Karolinska Institutet, Stockholm, Sweden
7. The Public Health Agency of Sweden, Stockholm, Sweden
8. Region Västra Götaland, Department of Obstetrics and Gynecology, Sahlgrenska University Hospital, Gothenburg, Sweden
9. Department of Obstetrics and Gynecology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
10. Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden
11. Department of Pediatrics, Örebro University Hospital, Örebro, Sweden
12. Department of Clinical Sciences, Pediatrics, Umeå University, Umeå, Sweden