1. Department of Dermatology, Royal Devon and Exeter NHS Foundation Trust , Exeter, Devon , UK
2. Department of Dermatology, The Royal London Hospital , London , UK
3. Watford General Hospital , Watford, Hertfordshire , UK
4. Sandwell and West Birmingham Hospitals , Birmingham , UK
5. Department of Dermatology, Birmingham City Hospital , Birmingham , UK
6. Department of Dermatology, Queens Medical Centre , Nottingham , UK