1. University of Zurich, Faculty of Medicine, Department of Neonatology and Pediatric Intensive Care, Children's Hospital St. Gallen, Neonatal and Pediatric Intensive Care Unit, St. Gallen, Switzerland.
2. Newborn Research, Department of Neonatology, University Hospital Zurich, University of Zurich, Zurich, Switzerland.
3. Clinic of Neonatology, Cantonal Hospital Winterthur, Winterthur, Switzerland.
4. Department of Neonatology and Pediatric Intensive Care, Children's Hospital, Lucerne, Switzerland.
5. Division of Neonatology and Pediatric Intensive Care, University Children's Hospital Zurich, Zurich, Switzerland.
6. University of Zurich, Faculty of Medicine, Zurich, Switzerland.
7. Children's Research Center, University Children's Hospital Zurich, Zurich, Switzerland.