1. Department of Pediatrics University of Cologne Cologne Germany
2. Department of Neonatology Vest Children's Hospital Datteln University Witten‐Herdecke Witten‐Herdecke Germany
3. Department of Pediatrics University of Lübeck Lübeck Germany
4. Department of Neonatology Klinikum Aschaffenburg Aschaffenburg Germany
5. Department of Neonatology Children's Hospital Leverkusen Leverkusen Germany
6. Department of Neonatology Children's Hospital Ruhr‐University Bochum Bochum Germany
7. Department of General Pediatrics University Hospital Düsseldorf Düsseldorf Germany
8. Department of Neonatology University of Bonn Bonn Germany
9. Department of Neonatology Olga Hospital Stuttgart Stuttgart Germany
10. Department of Neonatology and Pediatric Intensive Care Medicine Children's Hospital Cologne Germany
11. Department of Neonatology Charité University Medical Center Berlin Germany
12. Institute of Medical Statistics and Computational Biology University of Cologne Cologne Germany