1. Department of Dermatology, Royal Victoria Infirmary , Newcastle upon Tyne , UK
2. Department of Dermatology, University of Nottingham , Nottingham , UK
3. Department of Dermatology, Norfolk and Norwich University Hospital NHS Trust , Norwich , UK
4. Department of Dermatology, University of Southampton Faculty of Medicine , Southampton , UK
5. University of Aberdeen , Aberdeen , UK
6. Department of Dermatology, Newcastle Upon Tyne Hospitals NHS Trust , Newcastle upon Tyne , UK