1. Cutaneous Biology Research CenterMassachusetts General Hospital and Harvard Medical School Charlestown Massachusetts 02129 USA
2. Department of DermatologyUniversity Hospital EppendorfUniversity of Hamburg Hamburg D‐20246 Germany
3. Department of Dermatology, CharitéHumboldt University Berlin Germany
4. Centre for Cutaneous ResearchQueen Mary CollegeUniversity of London London U.K.
5. Department of DermatologyJohannes‐Gutenberg University Mainz Germany
6. Department of DermatologyBoston University Boston Massachusetts 02118 USA
7. Shiseido Research Center Yokohama Japan