Mahbub M Chowdhury1, Nicola Bevan2, Karen Ryan3. 1. Welsh Institute of Dermatology, University Hospital of Wales, Cardiff CF14 4XW, UK. 2. Employee Health and Wellbeing Services, Cardiff and Vale University Health Board, University Hospital of Wales, Cardiff, UK. 3. Occupational Health Department, Cardiff and Vale University Health Board, University Hospital of Wales, Cardiff, UK.