1. School of Medicine, University of Nottingham , Nottingham , UK
2. Lifespan and Population Health, School of Medicine, University of Nottingham , UK
3. Dermatology Department, Bristol Royal Infirmary , Bristol , UK
4. Bristol Medical School, University of Bristol , Bristol , UK
5. Centre of Evidence Based Dermatology, School of Medicine, University of Nottingham , Nottingham , UK