1. Faculty of Medicine School of Health Sciences University of Iceland Reykjavik Iceland
2. Division of Anesthesia and Intensive Care Medicine Landspitali—The National University Hospital of Iceland Reykjavik Iceland
3. Division of Neonatal Intensive Care Children’s Medical Center Landspitali—The National University Hospital of Iceland Reykjavik Iceland
4. Division of Anesthesia and Intensive Care Akureyri Hospital Akureyri Iceland
5. Internal Medicine Services Landspitali—The National University Hospital of Iceland Reykjavik Iceland