1. University Children's Hospital of Saarland; Neonatal Intensive Care Unit; Homburg Germany
2. University Children's Hospital of Saarland; NeoVitaA Trial; Homburg Germany
3. University Children's Hospital; Centre for Pediatric Clinical Studies; Tübingen Germany
4. Klinik für Kinder- und Jugendmedizin; Medizinische Universität Wien; Vienna Austria