1. Department of Otorhinolaryngology, Head and Neck Surgery, University Hospital Marburg, Philipps-University Marburg, Baldingerstrasse, 35043 Marburg, Germany
2. Department of Pediatric Neurology, Social Pediatrics and Epileptology, Justus-Liebig-University Giessen and University Hospital Marburg Giessen, Feulgenstrasse 10–12, 35392 Giessen, Germany
3. Department of Pediatrics, Faculty of Medicine and University Hospital Cologne, Kerpener Strasse 62, 50937 Cologne, Germany
4. Department of Otorhinolaryngology, Head and Neck Surgery, University of Cologne, Kerpener Strasse 62, 50937 Cologne, Germany
5. Department of Neonatology, Faculty of Medicine, University Hospital Cologne, Kerpener Strasse 62, 50937 Cologne, Germany