1. Division of Musculoskeletal and Dermatological Sciences, The University of Manchester, Manchester, United Kingdom
2. St John's Institute of Dermatology, Guy's and St Thomas’ NHS Foundation Trust, London, United Kingdom
3. Newcastle Dermatology, Newcastle Hospitals NHS Trust, Newcastle upon Tyne, United Kingdom
4. Dermatology Centre, Salford Royal NHS Foundation Trust, Manchester, United Kingdom
5. Centre for Pharmacoepidemiology and Drug Safety, The University of Manchester, Manchester, United Kingdom
6. Department of Dermatology, Royal Infirmary of Edinburgh, Edinburgh, United Kingdom