1. Department of Head and Neck Surgery UCLA David Geffen School of Medicine Los Angeles California U.S.A.
2. Advanced ENT and Allergy Louisville Kentucky U.S.A.
3. Arizona Desert Ear, Nose & Throat Specialists Goodyear Arizona U.S.A.
4. Department of Otorhinolaryngology Head and Neck Surgery, Faculty of Medicine and University Hospital Carl Gustav Carus Technische Universität Dresden Dresden Germany
5. ENT‐Center HNO‐Zentrum am Kudamm Berlin Germany
6. Department of Otolaryngology‐Head and Neck Surgery University of California San Francisco California U.S.A.
7. ENT and Allergy Associates of Florida Boca Raton Florida U.S.A.
8. Department of Otolaryngology – Head and Neck Surgery Thomas Jefferson University Philadelphia Pennsylvania U.S.A.
9. Fort Worth ENT Group Fort Worth Texas U.S.A.
10. Faculty of Medicine University Witten/Herdecke Witten Germany
11. Department of Electrical Engineering and Applied Natural Sciences Westphalian University of Applied Sciences Gelsenkirchen Germany
12. Department of Otorhinolaryngology Private ENT Practice Göttingen Germany