1. Head and Neck Unit; Royal Marsden Hospital; Fulham Road London United Kingdom
2. Wexham Park Hospital; Slough Berkshire United Kingdom
3. Department of Trauma and Orthopaedics; Kent and Canterbury Hospital; Ethelbert Road Kent United Kingdom
4. Department of Internal Medicine; University of Manitoba; Winnipeg Canada
5. Department of Otolaryngology - Head and Neck Surgery; Johns Hopkins University School of Medicine; Baltimore Maryland