1. Coronel Institute of Occupational Health, Academic Medical Centre, Amsterdam Public Health Research Institute; University of Amsterdam; Amsterdam The Netherlands
2. Department of Dermatology; VU University Medical Centre; Amsterdam The Netherlands
3. Department of Dermatology; University of Lübeck; Lübeck Germany
4. Centre for Nanotechnology, Serend-ip GmbH, Centre for Nanotechnology; Münster Germany
5. National Allergy Research Centre, Department of Dermatology and Allergy; Copenhagen University Hospital Herlev-Gentofte, University of Copenhagen; Hellerup Denmark