1. Department of Dermatology and Venerology, Otto-von-Guericke-University Magdeburg, Leipziger St. 44, 39120 Magdeburg, Germany
2. Department of Dermatology, Venerology, and Allergology, Medical Faculty Mannheim, Ruprecht-Karls-University of Heidelberg, Theodor-Kutzer-Ufer 1-3, 68167 Mannheim, Germany