Nina Scheiba1, Mindaugas Andrulis2, Peter Helmbold3. 1. Department of Dermatology, University of Heidelberg, Heidelberg, Germany. Electronic address: Nina.Scheiba@med.uni-heidelberg.de. 2. Institute of Pathology, University of Heidelberg, Heidelberg, Germany. 3. Department of Dermatology, University of Heidelberg, Heidelberg, Germany.