1. Copenhagen Trial Unit, Centre for Clinical Intervention Research; The Capital Region of Denmark, Rigshospitalet, Copenhagen University Hospital; Copenhagen Denmark
2. Department of Pediatric Surgery; Rigshospitalet, Copenhagen University Hospital; Copenhagen Denmark
3. Department of Surgery; John Hopkins All Children's Hospital; St Petersburg Florida USA
4. Department of Regional Health Research, The Faculty of Health Sciences; University of Southern Denmark; Odense Denmark
5. Neonatal Intensive Care Unit; Copenhagen University Hospital, Rigshospitalet; Copenhagen Denmark