1 Department of Dermatology, University Hospital Schleswig-Holstein, Campus Kiel, Kiel, Germany.
2 Department of Dermatology, University Medical Center Goettingen, Germany.
3 Department of Dermatology, Venereology, Allergology and Phlebology, Johannes Wesling Medical Centre, University Hospital of Ruhr-University Bochum, Minden, Germany.
4 Department of Dermatology, University Hospital Mannheim, Germany.
5 Department of Dermatology, University Hospital Würzburg, Germany.
6 Department of Dermatology, Ludwigshafen, Germany.
7 Hautklinik, Städtisches Klinikum Karlsruhe, Akademisches Lehrkrankenhaus der Universität Freiburg, Karlsruhe, Germany.
8 Department of Dermatology, Vivantes Klinikum Neukölln, Berlin, Germany.
9 Department of Dermatology, University Hospital Zurich, Switzerland.
10 Kempf und Pfaltz Histologische Diagnostik, Zurich, Switzerland.
11 Department of Dermatology, Helios-Klinikum Krefeld, Germany.