Medical Progress

From the Rudolf Virchow Center, DFG Research Center for Experimental Biomedicine, and the Department of Dermatology, University of Wurzburg, Wurzburg (M.P.S.); and the Department of Dermatology, University of Frankfurt, Frankfurt (W.-H.B.) - both in Germany. Address reprint requests to Dr. Schon at the Rudolf Virchow Center, DFG Research Center for Experimental Biomedicine and Department of Dermatology, Julius Maximilians University, Versbacher Str. 9, 97078 Wurzburg, Germany, or at [email protected].