1. Department of Dermatology, Venereology and Allergology University Hospital Würzburg Würzburg Germany
2. Department for Dermatology and Allergy University Bonn Bonn Germany
3. Central Study Coordination for Innovative Dermatology (ZID) University Dermatology Clinic Münster Münster Germany
4. Department of Dermatology Ruhr‐University Bochum Bochum Germany
5. Biogen GmbH Munich Germany
6. Biogen International GmbH Baar Switzerland
7. Biogen Idec Ltd Maidenhead UK