1. Department of Pediatrics, University Hospital of Schleswig-Holstein, Lübeck, Germany
2. Department of Paediatrics, Diakonissenkrankenhaus, Flensburg, Germany
3. Department of Pediatrics, Saarbrücken General Hospital, Saarbrücken, Germany
4. Department of Neonatology, Children’s Hospital, Aschaffenburg, Germany
5. Department of Neonatology, University Hospital Aachen, Aachen, Germany
6. Departments of Pediatrics I, Neonatology, University Hospital, Essen, Germany