1. Department of Otorhinolaryngology, Head and Neck Surgery; Wexham Park Hospital; Slough, Berkshire UK
2. Department of Radiology; Wexham Park Hospital; Slough, Berkshire UK
3. School of Clinical Dentistry; The University of Sheffield; Sheffield UK
4. Depatment of Otorhinolaryngology, Head and Neck Surgery; John Radcliffe Hospital; Oxford UK