1. Department of Clinical Science and Education, Södersjukhuset, Sachs Children's Hospital,
2. Divisions of Neonatology and
3. Astrid Lindgren Children's Hospital, Danderyd, Karolinska University Hospital, Stockholm, Sweden
4. Division of Applied Public Health, Department of Public Health Sciences, Karolinska Institutet, Stockholm, Sweden; and
5. Reproductive and Perinatal Health Care, Department of Woman and Child Health, and