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