1. Department of Head and Neck Surgery Royal Devon and Exeter Hospital Exeter UK
2. Institute of Biomedical and Clinical Science, College of Medicine and Health University of Exeter Exeter UK
3. Department of Endocrinology Royal Devon and Exeter Hospital Exeter UK
4. Department of Head and Neck Surgery St George's University Hospital London UK
5. Sydney Head and Neck Cancer Institute Chris O'Brien Lifehouse Sydney New South Wales Australia
6. Central Clinical School University of Sydney Sydney New South Wales Australia