1. Centre for Pharmacoepidemiology and Drug Safety Manchester Pharmacy School The University of Manchester Manchester U.K
2. Dermatology Centre Salford Royal NHS Foundation Trust Manchester Academic Health Science Centre The University of Manchester Barnes BuildingManchester M6 8HDU.K
3. Arthritis Research U.K. Epidemiology Unit The University of Manchester Manchester U.K
4. St John's Institute of Dermatology Guy's and St Thomas’ NHS Foundation Trust London U.K
5. Department of Dermatology Western Infirmary Glasgow U.K
6. Division of Applied Medicine University of Aberdeen Foresterhill Aberdeen U.K
7. Dermatological Sciences Institute of Cellular Medicine Medical School Royal Victoria Infirmary Newcastle University Newcastle upon Tyne U.K