1. Department of Dermatology (U.O.), University Hospital Hamburg-Eppendorf, University of Hamburg, D-20246 Hamburg, Germany;
2. Department of Paediatric Haematology and Oncology (M.U.), Hannover Medical School, D-30625 Hannover, Germany;
3. Department of Biosciences and Nutrition (J.I., J.-Å.G.), Karolinska Institute, Novum, SE-14186 Stockholm, Sweden;
4. Department of Dermatology (R.P.), University Hospital Schleswig-Holstein, Campus Lübeck, University of Lübeck, D-23538 Lübeck, Germany