1. Department of Dermatology; University Hospital of Muenster; Muenster Germany
2. Dermatological Office Professor Schiller; Coesfeld Germany
3. Department of Dermatology; Charité; Berlin Germany
4. Department of Dermatology; University Hospital; Zurich Switzerland
5. WiSP Wissenschaftlicher Service Pharma GmbH; Langenfeld Germany
6. Department of Dermatology; Klinikum Dortmund; Dortmund Germany
7. Department of Dermatology; Johannes Wesling Klinikum Minden; University Hospital of Ruhr University of Bochum; Bochum Germany