1. Department of Dermatology; Ruprecht-Karls-University Heidelberg; Heidelberg Germany
2. Department of Dermatology; Philipps-University Marburg; Marburg Germany
3. Department of Dermatology; Eberhard-Karls-University Tübingen; Tübingen Germany
4. Department of Dermatology; University of Zurich; Zurich Switzerland
5. Department of Dermatology; University of Verona; Verona Italy
6. Immunodeficiency Centre for Wales; University Hospital of Wales; Cardiff UK
7. Department of Dermatology; Semmelweis University Budapest; Budapest Hungary
8. Department of Dermatology; Johannes Gutenberg-University Mainz; Mainz Germany
9. Department of Dermatology; Medical University of Vienna; Vienna Austria
10. Department of Dermatology; University of Lübeck; Lübeck Germany