1. Department of Ear, Nose and Throat Surgery, Great Ormond Street Hospital for Children, London, United Kingdom
2. Department of Ear, Nose and Throat Surgery, St George's University Hospital, London, United Kingdom
3. Department of Neurology/Stroke Medicine, Royal Surrey County Hospital, Surrey, United Kingdom
4. GKT School of Medical Education, King's College London
5. Department of Ear, Nose and Throat Surgery, University Hospital Lewisham, London, United Kingdom