1. Department of Neonatology, Rigshospitalet University of Copenhagen Copenhagen Denmark
2. Departments of Paediatrics Holbaek University Hospital Holbaek Denmark
3. Department of Clinical Biochemistry Holbaek University Hospital Holbaek Denmark
4. Department of Paediatrics Aalborg Hospital University of Aalborg Aalborg Denmark
5. Department of Paediatrics Odense Hospital University of Southern Denmark Odense Denmark
6. Department of Paediatrics Kolding Hospital University of Southern Denmark Kolding Denmark
7. Department of Paediatrics Herlev Hospital University of Copenhagen Copenhagen Denmark
8. Department of Paediatrics Hvidovre Hospital University of Copenhagen Copenhagen Denmark