1. From the Department of Medicine I, Bone Marrow Transplantation Unit, the Department of Dermatology, Division of Immunology, Allergy and Infectious Diseases, and the Department of Dermatology, Division of Special and Environmental Dermatology, University of Vienna, Vienna, Austria; and the Department of Dermatology, Division of Clinical and Experimental Dermatology, Heinrich-Heine-University of Duesseldorf, Duesseldorf, Germany.