1. Department of Otorhinolaryngology – Head and Neck Surgery Medical University of Vienna Vienna Austria
2. Institute for Head and Neck Diseases Evangelical Hospital Vienna Vienna Austria
3. Department of Otorhinolaryngology – Head and Neck Surgery University of Rijeka Rijeka Croatia
4. Shaukat Khanum Memorial Cancer Hospital Lahore Pakistan
5. Division of Plastic and Reconstructive Surgery, Department of Surgery Hospital of Divine Savior Vienna Austria
6. Faculty of Medicine Sigmund Freud University Vienna Austria
7. TZOU MEDICAL Vienna Austria
8. Department of Plastic and Maxillofacial Surgery Uppsala University Hospital Uppsala Sweden
9. Department of Surgical Sciences Uppsala University Hospital Uppsala Sweden