1. Departments of Dermatology, Mannheim Medical School, University of Heidelberg, 68135 Mannheim, Germany,
2. University of Milan, Ospedale Riuniti, 24100 Bergamo, Italy,
3. Technical University, 80802 Munich, Germany,
4. Harvard University, Boston, MA 02215, U.S.A.,
5. University Hospital, Nottingham NG7 2UH, U.K.