1. Pediatrics I, University of Duisburg-Essen, Essen, Germany
2. Department of Neonatology and Pediatric Intensive Care, Children’s Hospital, University of Cologne, Cologne, Germany
3. Department of Pediatrics, St. Vincenz Hospital, Dinslaken, Germany
4. Department of Pediatrics, Bergmannsheil und Kinderklinik GmbH, Gelsenkirchen, Germany
5. Department of Pediatrics, St.-Agnes-Hospital, Bocholt, Germany
6. Department of Pediatrics, Florence-Nightingale-Krankenhaus, Düsseldorf, Germany
7. Department of Pediatrics, Evangelisches Krankenhaus, Oberhausen, Germany
8. Department of Pediatrics, Bethanien Krankenhaus, Moers, Germany
9. Centre for Child and Adolescent Health, HELIOS Klinikum Krefeld, Krefeld, Germany
10. Department of Pediatrics, Community Hospital Dortmund, Dortmund, Germany
11. Department of Pediatrics, St. Josephs Hospital, University of Bochum, Bochum, Germany
12. Department of Neonatology and Pediatric Intensive Care Medicine, University Hospital Witten/Herdecke, Datteln, Germany
13. Department of Neonatology, Elisabeth-Krankenhaus, Essen, Germany
14. Department of Pediatrics, Helios Klinikum, Wuppertal, Germany
15. Department of Pediatrics, Klinikum Niederberg, Velbert, Germany
16. Department of Pediatrics, Klinikum Duisburg, Duisburg, Germany
17. Department of Pediatrics, Helios Klinikum, Duisburg, Germany