University of Giessen, University of Tübingen - Children's Hospital, University Medical Center Ulm, University Medical Center Ulm, Hannover Medical School, University of Hamburg - University Medical Center Hamburg-Eppendorf, University of Hamburg - University Medical Center Hamburg-Eppendorf, University of Bern - Bern University Hospital, University of Giessen, University of Wuerzburg, Goethe University Frankfurt, Children’s Hospital, Kassel, Children’s Hospital, Muenster University Hospital, University Hospital Münster, Ruhr-University Bochum - Department of Pediatrics, University of GiessenUniversity of Giessen, Hannover Medical School, Schleswig-Holstein University - Department of Pediatrics, University of Tübingen - Children's Hospital and University Medical Center Ulm