1. Department of ENT&HNS, ‘Marie S. Curie’ Emergency Children Hospital Bucharest, 041434 Bucharest, Romania
2. Department of ENT&HNS, Bucharest Emergency University Hospital, 050098 Bucharest, Romania
3. Department of ENT&HNS, ‘Dr. Carol Davila’ Central Military Emergency University Hospital, 010825 Bucharest, Romania
4. Department of ENT&HNS, ‘Sfânta Maria’ Clinical Hospital, 011172 Bucharest, Romania
5. Department of ENT&HNS, Faculty of Medicine, ‘Titu Maiorescu’ University, 031593 Bucharest, Romania