1. Department of Otorhinolaryngology, Head Neck Surgery Medical University of Vienna Vienna Austria
2. Institute of Head and Neck Diseases Evangelical Hospital Vienna Austria
3. Shaukat Khanum Memorial Cancer Hospital and Research Centre Lahore Pakistan
4. Center of Anatomy and Cell Biology Medical University of Vienna Vienna Austria
5. Department of Surgery‐Otorhinolaryngology, Head and Neck Surgery, The Queen Elizabeth Hospital, Australia and University of Adelaide Adelaide Australia
6. Otolaryngology Department Pontificia Universidad Católica de Chile Santiago Chile