1. Department of Paediatric Cardiology, Pulmology and Paediatric Intensive Care Medicine, University Children’s Hospital Tübingen, Tübingen, Germany
2. Neonatology/FIPS, Childrens’ Hospital Heidelberg, Heidelberg, Germany
3. Department of Neonatology, Tübingen University Hospital, Tübingen, Germany
4. Department of Neonatology, University Hospital Aachen, Aachen, Germany