1. Centre of Public Health Sciences Faculty of Medicine University of Iceland Reykjavik Iceland
2. Department of Obstetrics and Gynecology Landspitali ‐ The National University Hospital of Iceland Reykjavik Iceland
3. Faculty of Nursing – Department of Midwifery University of Iceland Reykjavik Iceland
4. Institution of Health Science Research University of Akureyri and Akureyri Hospital Akureyri Iceland
5. Division of Neonatal Intensive Care Children's Medical Center Landspitali – The National University Hospital of Iceland Reykjavik Iceland