Zainab Jiyad, is a Consultant Dermatologist at St George’s Hospital, London, UK and an Honorary Senior Lecturer at the Population Health Research Institute, St George’s University of London, UK. Carsten Flohr, is Chair in Dermatology and Population Health Science, St John’s Institute of Dermatology, King’s College London and an Honorary Consultant Dermatologist at Guy’s & St Thomas’ NHS Foundation Trust, London, UK