1. Department of Surgery-Otolaryngology; University of Adelaide; Adelaide Australia
2. Department of Otorhinolaryngology-Head and Neck Surgery; University of Greifswald; Greifswald Germany
3. Otorhinolaryngology Department; Pontificia Universidad Católica de Chile; Santiago Chile
4. Division of Sinus and Skull Base Surgery; Department of Otorhinolaryngology Hospital; Karlsruhe Germany
5. Department of Otorhinolaryngology-Head and Neck Surgery; University of Pennsylvania; Philadelphia PA
6. Department of Otorhinolaryngology-Head and Neck Surgery; University of Texas Medical School at Houston; Houston TX
7. Division of Rhinology, Allergy, and Endoscopic Skull Base Surgery; University of North Carolina at Chapel Hill; Chapel Hill NC
8. Division of Rhinology and Sinus/Skull Base Surgery; Oregon Health and Science University; Portland OR
9. Department of Otolaryngology-Head and Neck Surgery; Stanford University School of Medicine; Stanford CA
10. Division of Otolaryngology-Head and Neck Surgery; University of Utah; Salt Lake City UT
11. Department of ENT; Sankt Gertrauden Krankenhaus; Berlin Germany
12. Department of Otolaryngology; Tan Tock Seng Hospital National University of Singapore; Singapore
13. Department of Otolaryngology; Military Institute of Medicine; Warsaw Poland
14. Department of Otolaryngology-Head and Neck Surgery; University of Mannheim; Frankfurt Germany
15. HNO-Klinik; Klinikum Dahme-Spreewald GmbH, Königs-Wusterhausen; Germany
16. University of Barcelona Medical School; Barcelona Spain
17. ORL-Dept, Head and Neck Surgery; University of Regensburg; Germany