Günter Burg, MD, is Professor of Dermatology and Chairman Emeritus, University of Zurich, Zurich, Switzerland. Heinz Kutzner, MD, is Professor of Dermatology, Institute of Dermatopathology, Friedrichshafen, Germany. Werner Kempf, MD, is Professor of Dermatology, Department of Dermatology, University of Zurich, Zurich, Switzerland, and Founder and Co-Director of the dermatopathology laboratory Kempf und Pfaltz Histologische Diagnostik, Zurich, Switzerland. Josef Feit, MD, is Associate Professor of Pathology, University of Ostrava, Ostrava, Czech Republic. Omar Sangueza, MD, is Professor of Pathology and Dermatology, Director of Dermatopathology, Wake Forest School of Medicine, Winston-Salem, NC, USA.