1. Department of Dermatology, Inselspital, University of Bern, Freiburgstrasse 14, 3010 Bern, Switzerland
2. Dermatology Practice Dermaticum, Freiburg, Germany
3. Centro de Dermatología Epidermis, Instituto CUF, Porto, Portugal
4. Department of Dermatology, Acad Hospital, University of Ghent, Gent, Belgium