1. Department of Oto-Rhino-Laryngology and Head-Neck Surgery, Faculty of Medicine, University of Szeged, Hungary
2. Department of Pediatric-ENT, Faculty of Medicine, University of Pécs, Pécs, Hungary
3. Pál Heim Children’s Hospital, Budapest, Hungary
4. Department of Medical Microbiology, Faculty of Medicine, University of Szeged, Szeged, Hungary