1. Department of Medical Informatics, Biometry and Epidemiology; University of Erlangen/Nürnberg; 91054 Erlangen Germany
2. Department of Dermatology; Chapel Allerton Hospital; LS7 4SA Leeds UK
3. Department of Clinical Social Medicine; University Hospital Heidelberg; 69115 Heidelberg Germany
4. Department of Dermatology; Inselspital, Bern University Hospital; 3010 Bern Switzerland
5. Department of Dermatology; University Hospital Zürich; 8091 Zürich Switzerland
6. Centre for Dermatology and Allergology; Kantonsspital Luzern; 2016 Luzern Switzerland
7. Department of Dermatology, Allergy Unit; University Hospital Erlangen; 91054 Erlangen Germany
8. Department of Dermatology and Allergology; University Medical Centre Göttingen; 37075 Göttingen Germany
9. Information Network of Departments of Dermatology (IVDK); University Medicine Göttingen; 37075 Göttingen Germany