1. Division of Environmental Dermatology and Allergology GSF/TUM, Department of Dermatology and Allergy,
am Biederstein, Munich Technical University, Biedersteiner Str. 29, 80802 Munich, Germany
2. Medical Institute for Environmental Hygiene, University of Düsseldorf, Düsseldorf, Germany
Hospital for Dermatology and Allergy, Borkum, Germany