1. Department of Dermatology; Leiden University Medical Center; Leiden The Netherlands
2. Department of Dermatology; Barts and the London School of Medicine and Dentistry; Queen Mary University of London; London UK
3. Department of Dermatology; Medical College of Wisconsin; Milwaukee WI
4. Departments of Nephrology (A.L.S.) and Dermatology; University Hospital Zürich; Zürich Switzerland
5. Dermatology Unit; Department of Medicine; University of Padua; Padua Italy
6. Department of Dermatology; Division of Immunology; Allergy and Infectious Diseases (DIAID); Medical University of Vienna; Vienna Austria
7. Department of Dermatology; Radboud University Medical Center; Nijmegen The Netherlands
8. Department of Dermatology; Başkent University Faculty of Medicine; Ankara Turkey
9. Department of Dermatology; Charles University Hospital; Pilsen Czech Republic
10. Department of Dermatology; Pomeranian Trauma Center; Gdansk Poland
11. Department of Dermatology; Division of Cancer Research; Medical Research Institute; College of Medicine; Dentistry; and Nursing; Ninewells Hospital; University of Dundee; Dundee UK