1. Department of Pediatric Otolaryngology, Poznan University of Medical Sciences, Szpitalna 27/33, 60-572 Poznan, Poland
2. Department of Pediatric Radiology, Poznan University of Medical Sciences, Szpitalna 27/33, 60-572 Poznan, Poland
3. Department of Pathology, Poznan University of Medical Sciences, Szpitalna 27/33, 60-572 Poznan, Poland