1. Department of Dermatology, Venereology and AllergologyUniversity Medical Center Göttingen Germany
2. Institute of PathologyUniversity of Würzburg Würzburg Germany
3. Practice for Pediatric Dermatology Heidelberg Germany
4. Department of Dermatology, Venereology and Allergology, and Lower Saxony Institute of Occupational DermatologyUniversity Medical Center Göttingen Germany
5. Kempf und Pfaltz, Histologische Diagnostik, Zürich, Switzerland, and Department of DermatologyUniversity Hospital Zurich Switzerland