1. Research Unit, Fundación Piel Sana AEDV , Madrid
2. Department of Dermatology, Complexo Hospitalario Universitario de Vigo , Vigo , Spain
3. Translational and Clinical Research Institute, Newcastle University
4. Department of Dermatology, Royal Victoria Infirmary , Newcastle upon Tyne , UK
5. Department of Dermatology, Salford Care Organisation part of the Northern Care Alliance NHS Foundation Trust , Manchester , UK
6. Department of Dermatology, Prince of Wales Hospital , Sydney , Australia
7. Study Center of the Italian Group for Epidemiologic Research in Dermatology (GISED) , Bergamo
8. Department of Dermatology, San Bortolo Hospital , Vicenza , Italy
9. St John’s Institute of Dermatology, Guy’s and St Thomas’ NHS Foundation Trust
10. St John’s Institute of Dermatology, King’s College , London, UK