1. Copenhagen Trial Unit, Centre for Clinical Intervention Research, Department 7812; Rigshospitalet, Copenhagen University Hospital; Copenhagen Denmark
2. Pediatric Department; Holbaek Sygehus; Holbaek Denmark
3. Copenhagen Trial Unit, Centre for Clinical Intervention Research; Department 7812, Rigshospitalet, Copenhagen University Hospital; Copenhagen Denmark
4. Neonatology; Beth Israel Deaconess Medical Center; Boston USA
5. Department of Neonatology; Rigshospitalet, Copenhagen University Hospital; Copenhagen Denmark
6. Pediatric and Neonatal Intensive Care Unit; Paris South University Hospitals Le Kremlin-Bicêtre; Paris France
7. Cochrane Hepato-Biliary Group; Copenhagen Trial Unit, Centre for Clinical Intervention Research, Department 7812, Rigshospitalet; Copenhagen Denmark
8. Department of Cardiology; Holbaek Hospital; Holbaek Denmark
9. Department of Regional Health Research, the Faculty of Health Sciences; University of Southern Denmark; Holbaek Denmark