1. Centre for Rheumatic Diseases, King’s College London , London , UK
2. Division of Psychiatry, University College London , London , UK
3. Department of Non-communicable Disease Epidemiology, London School of Hygiene & Tropical Medicine , London , UK
4. St John’s Institute of Dermatology, NIHR Biomedical Research Centre, Guy's and St Thomas' NHS Foundation Trust, King’s College London , London , UK