1. Department of Paediatrics and Adolescent Medicine Nordsjaellands Hospital in Hilleroed Hilleroed Denmark
2. The Danish Clinical Quality Program – National Clinical Registries (RKKP) Aarhus Denmark
3. Department of Paediatrics and Adolescent Medicine Aarhus University Hospital Aarhus Denmark
4. Hans Christian Andersen Children's Hospital Odense University Hospital and University of Southern Denmark Odense Denmark
5. Department of Paediatrics Aalborg University Hospital Aalborg Denmark
6. Department of Intensive Care for Newborns and Infants Copenhagen University Hospital, Rigshospitalet Copenhagen Denmark
7. Department of Obstetrics and Gynaecology Aalborg University Hospital Aalborg Denmark