1. Copenhagen Trial Unit, Centre for Clinical Intervention Research; The Capital Region of Denmark, Rigshospitalet, Copenhagen University Hospital; Copenhagen Denmark
2. Neonatal Intensive Care Unit; Ospedale "A. Manzoni"; Lecco Italy
3. Copenhagen Trial Unit, Centre for Clinical Intervention Research, Department 7812; Rigshospitalet, Copenhagen University Hospital; Copenhagen Denmark
4. Department of Pediatrics and Adolescence; Copenhagen University Hospital, Rigshospitalet; Copenhagen Denmark
5. Department of Regional Health Research, The Faculty of Health Sciences; University of Southern Denmark; Odense Denmark