1. Department of Dermatology, Buckinghamshire Healthcare NHS Trust, Amersham HP7 0JD, UK
2. Centre for Medical Education, School of Medicine, Cardiff University, Cardiff CF14 4YS, UK
3. Patient Research Partner, Gloucestershire, UK
4. Medical Research Council, Polaris House, Swindon SN2 IFL, UK
5. Division of Infection and Immunity, School of Medicine, Cardiff University, Cardiff CF14 4YS, UK