1. Private Practice Stuttgart, Department of Dermatology, University of Freiburg
2. Department of Dermatology, University Medical Center Mainz-
3. Private Practice Freising, University Medicine Mannheim
4. Private Practice Mönchengladbach
5. Private Practice Zentderma Mönchengladbach
6. Department of Dermatology and Allergy, Charité - Universitätsmedizin Berlin, Germany