1. Medical Sociology, Institute of Epidemiology and Preventive Medicine; University of Regensburg; Regensburg Germany
2. Department of Clinical Social Medicine; Occupational and Environmental Dermatology, University Hospital, Ruprecht Karls University Heidelberg; Heidelberg Germany
3. Department of Dermatology and Allergy; Ludwig-Maximilian-University; Munich Germany
4. Department of Dermatology; University Hospital Carl Gustav Carus, Technical University Dresden; Dresden Germany
5. Department of Dermatology, University Allergy Centre (UAC), University Hospital Carl Gustav Carus, Technical University Dresden; Dresden Germany
6. Department of Dermatology; University Hospital of Erlangen, Friedrich-Alexander-University Erlangen; Erlangen Germany
7. Allergology Division, Paul-Ehrlich-Institut; Langen Germany
8. Dermatological practice; Landsberg Germany
9. Company for Medical Study & Service Selters; Selters Germany
10. Centre for Evidence-based Healthcare, Medical Faculty Carl Gustav Carus, Technical University Dresden; Dresden Germany
11. Department of Dermatology; University Hospital Jena; Jena Germany