1. Department of DermatologyVenereology and AllergologyHELIOS Medical Center Hildesheim Hildesheim Germany
2. Department of DermatologyVenereology and AllergologyGöttingen University Medical Center Göttingen Germany
3. Department of DermatologyVenereologyAllergologyand PhlebologyMühlenkreisklinikenJohannes Wesling Medical Center Minden Germany
4. Eduard Arning Department of Dermatology and AllergologyAsklepios Klinik St. Georg Hamburg Germany
5. Kempf und PfaltzDermatopathology Laboratory Zurich Switzerland
6. Department of DermatologyVenereology and AllergologyZurich University Hospital Zurich Switzerland