1 International League of Dermatological Societies, 4 Fitzroy Square, London, W1T 5HQ, U.K.
2 King's College London, King's College Hospital NHS Trust, London, U.K.
3 Institute for Health Services Research in Dermatology and Nursing (IVDP), University Medical Center Hamburg-Eppendorf, Martinistraße 52, D-20246, Hamburg, Germany.
4 Dermatology Centre, Salford Royal NHS Foundation Trust, Manchester Academic Health Science Centre, University of Manchester, Manchester, U.K.
5 Department of Dermatology, Charité University Medicine, Berlin, Germany.