1. Department of Dermatology; Royal London Hospital, Barts Health NHS Trust; London UK
2. Centre for Evidence Based Healthcare, Division of Epidemiology and Public Health, Clinical Sciences Building Phase 2; University of Nottingham; Nottingham UK
3. Centre of Evidence Based Dermatology; University of Nottingham; Nottingham UK
4. Emeritus Professor, Evidence Based Health Care; University of Nottingham; Nottingham UK