1. Department of Clinical Social Medicine; University Hospital Heidelberg; Thibautstr. 3 69115 Heidelberg Germany
2. TransPerfect Life Sciences; Linguistic Validation Group; 420 Boylston Street 02116 Boston MA USA
3. Department of Dermatology and Allergy; Ludwig-Maximilians-University Munich; Frauenlobstraße 9-11 80337 Munich Germany
4. Department of Dermatology; University Hospital Carl Gustav Carus, Technical University Dresden; Fiedlerstraße 19 01307 Dresden Germany
5. Department of Dermatology; University Allergy Centre, University Hospital Carl Gustav Carus, Technical University Dresden; Fetscherstr. 74 01307 Dresden Germany
6. Department of Dermatology; University Hospital of Erlangen, Friedrich-Alexander-University Erlangen-Nuremberg; Ulmenweg 18 91054 Erlangen Germany
7. Department of Dermatology and Dermatological Allergy; Friedrich-Schiller-University Jena; Erfurter Straße 35 07743 Jena Germany
8. Centre for Evidence-based Healthcare, Medical Faculty Carl Gustav Carus, TU Dresden; Fetscherstraße 74 01307 Dresden Germany
9. Medical Sociology, Department of Epidemiology and Preventive Medicine; University Hospital Regensburg; Dr.-Gessler-Str. 17 93051 Regensburg Germany