1. Department of Clinical Medicine, University of Cambridge, Cambridge, UK
2. Department of Otolaryngology-Head and Neck Surgery, University of Brescia, Brescia, Italy
3. Medical Library, University of Cambridge, Cambridge, UK
4. Department of Otolaryngology-Head and Neck Surgery, Cambridge University Hospitals NHS Trust, Cambridge, UK
5. Department of Medicine, Surgery and Health Sciences, University of Trieste, Trieste, Italy