University of Karlsruhe, University of Karlsruhe, University of Tübingen - Children's Hospital, Ulm University - Department of Pediatrics and Adolescent Medicine, Justus Liebig University Giessen, Justus Liebig University Giessen, Medical University Wien - Center of Paediatrics, Medical University Wien - Center of Paediatrics, University of Duisburg-Essen - University Hospital Essen, University of Duisburg-Essen - Department of Pediatrics I, Neonatology, Clinical Centre Oldenburg - Clinic for Neonatology, Clinical Centre Oldenburg - Clinic for Neonatology, Clinical Centre Oldenburg - Clinic for Neonatology, University Hospital Münster, University Hospital Münster, Ruhr University of Bochum - St. Josef-Hospital Bochum, Ruhr University of Bochum - St. Josef-Hospital Bochum, Cnopf´sche Kinderklinik - Clinic for Neonatology and Paediatric Intensive Care, Cnopf´sche Kinderklinik - Clinic for Neonatology and Paediatric Intensive Care, Klinikum Saarbrücken, University of Leipzig - University Hospital Leipzig, University of Greifswald - Department of Pediatrics, Barmherzige Brüder Hospital Regensburg, Clinical Centre Aschaffenburg-Alzenau, Medical University of Innsbruck, Ludwig Maximilian University of Munich (LMU) - Dr. von Hauner Children's Hospital, University Hospital Magdeburg, Hospital Motherhouse of the Borromäerinnen, Sana Hospital Duisburg, Evangelical Hospital Oberhausen, Westpfalz Hospital, University of Bonn - University Hospital Bonn (UKB), University Hospital Freiburg, Loschgestraße, University of Hohenheim, University of Hohenheim, University Hospital Ulm, University of Karlsruhe, University of Karlsruhe, Johannes Gutenberg University Mainz, Johannes Gutenberg University Mainz and University of Karlsruhe