1. Department of ENT and HNS, Faculty of Medicine, ‘Titu Maiorescu’ University, 031593 Bucharest, Romania
2. Department of ENT and HNS, Polimed Medical Center, 040067 Bucharest, Romania
3. Department of ENT and HNS, ‘Sf. Maria’ Clinical Hospital, 011172 Bucharest, Romania
4. Department of ENT and HNS, ‘Dr. Carol Davila’ Central Military Emergency University Hospital, 010825 Bucharest, Romania
5. Technical University of Munich, Institute of Astronomical and Physical Geodesy, D-80333 Munich, Germany
6. Department of ENT and HNS, ‘Carol Davila’ University of Medicine and Pharmacy, 020021 Bucharest, Romania