1. Department of Pediatric Otorhinolaryngology; Pécs University, Pécs; Budapest Hungary
2. Department of Pediatric Otorhinolaryngology and Bronchology; Heim Pál Hospital; Budapest Hungary
3. Department of Otorhinolaryngology & Head and Neck Surgery; Pécs University, Pécs; Budapest Hungary
4. Klebelsberg Institution Maintenance Center; Hungary; Budapest Hungary