1. Department of Dermatology, Venereology and Allergology Ruhr‐University Gudrunstraße 56 D‐44791 Bochum Germany
2. Department of Dermatology University Hospital Monklands Lanarkshire U.K.
3. School of Medicine University of Glasgow Glasgow U.K.
4. CentroDerm Clinic Heinz‐Fangman‐Straße 57 Wuppertal Germany
5. Faculty of Health University Witten‐Herdecke Alfred‐Herrhausen‐Straße 50 Witten Germany