1. Endoscopic Skull Base Centre Athens Hygeia Hospital Erythrou Stavrou 4 Maroussi Athens, 15123 Greece
2. Medical School University of Nicosia 93 Agiou Nikolaou Street, Engomi Nicosia 2408 Cyprus
3. Department of Neurosurgery Evangelismos University Hospital Athens Athens Greece
4. Department of ENT and Skull Base Surgery Birmingham Hospital Birmingham UK
5. Department of Otorhinolaryngology University of Insubria Varese Italy
6. Department of Otolaryngology ‐ Head and Neck Surgery Azienda Ospedaliero‐Universitaria Pisana Pisa Italy
7. Department of Neurosurgery Leiden University Medical Center (LUMC) Leiden Netherlands
8. Sydney ENT clinic Sydney Australia
9. Department of Otolaryngology Hôpital Lariboisière Paris France
10. Department of Neurosurgery Hygeia Hospital Athens Greece
11. Neurosurgical Clinic, Insubria University, ASST Settelaghi Varese Italy
12. Department of ORL‐HNS Ankara University Medical School Ankara Turkey
13. Department of ORL‐HNS Salzburg Paracelsus Medical University Salzburg Austria
14. Otorhinolaryngology–Head and Neck Surgery Hospital of the University of Pennsylvania Philadelphia PA
15. ENT Department Hospital de Clinicas de Porto Alegre ‐ UFRGS Brazil
16. ENT Surgeon Spire Nottingham Hospital Nottingham UK
17. Department of Otolaryngology ‐ Head and Neck Surgery Charing Cross Hospital London UK
18. ENT Surgery Imperial College London UK
19. ENT Cleveland Clinic Cleveland OH
20. Department of Otorhinolaryngology UZ Ghent University Hospital Gent Belgium
21. Department of Otolaryngology University of Alabama at Birmingham Birmingham AL