1. Dorset County Hospital Dorchester UK
2. Department of Otolaryngology ‐ Head and Neck Surgery Massachusetts Eye and Ear Infirmary Boston Massachusetts
3. Eaton‐Peabody Laboratories Massachusetts Eye and Ear Infirmary Boston Massachusetts
4. Department of Surgery, Otolaryngology University of Melbourne East Melbourne Victoria Australia
5. Department of Otolaryngology, Head and Neck Surgery University Hospital Bern Bern Switzerland
6. Department of Otolaryngology University of Colorado Anschutz Medical Campus Aurora Colorado
7. Department of Otorhinolaryngology, Head and Neck Surgery University Hospital Zurich Zurich Switzerland
8. University of Zurich Zurich Switzerland