1. Faculty of Medicine and Dentistry; University of Bristol; Senate House, Tyndall Avenue; Bristol; BS8 1TH; U.K
2. Department of Plastic and Reconstructive Surgery; Frenchay Hospital; Bristol; BS16 1LE; U.K
3. Department of Dermatology; Gloucestershire Royal Hospital, Gloucester Hospitals NHS Foundation Trust; Gloucester; GL1 3NL; U.K
4. Department of Oral and Maxillofacial Surgery; Gloucestershire Royal Hospital; Gloucester Hospitals NHS Foundation Trust; Gloucester; GL1 3NL; U.K