1. Departments of Pediatrics; Holbaek University Hospital; Holbaek Denmark
2. Department of Neonatology; Rigshospitalet; University of Copenhagen; Copenhagen Denmark
3. Department of Neonatology; Southampton Hospital; University of Southampton; England UK
4. Department of Neonatology; Royal Maternity Hospital; Belfast Northern Ireland UK
5. Department of Clinical Biochemistry; Holbaek University Hospital; Holbaek Denmark
6. Department of Pediatrics Aalborg Hospital; University of Aalborg; Aalborg Denmark
7. Departments of Pediatric Surgery and Neonatology; Skåne University Hospital; Lund Sweden
8. Department of Clinical Sciences; University of Lund; Lund Sweden
9. Department of Pediatrics; Odense Hospital; University of Southern; Odense Denmark
10. Department of Pediatrics; Kolding Hospital; University of Southern; Koldin Denmark
11. Departments of Pediatrics; Herlev Hospital; University of Copenhagen; Copenhagen Denmark
12. Department of Neonatology Linköping; University of Linköping; Linköping Sweden
13. Child Health; Academic Unit of Clinical and Experimental Sciences and Respiratory Biomedical Research Unit; Southampton General Hospital; University of Southampton; England UK
14. Department of Pediatrics; Hvidovre Hospital; University of Copenhagen; Copenhagen Denmark
15. Department of Pediatrics; Naestved University Hospital; Naestved Denmark