1. Department of Dermatology; University Hospital of Zurich; Zurich Switzerland
2. Institute of Infection Inflammation and Immunity; University of Glasgow; Glasgow UK
3. Division of Genetics and Molecular Medicine; King's College; London UK
4. Psoriasis Center at the Department of Dermatology; University Medical Center, Schleswig-Holstein, Campus Kiel; Kiel Germany
5. Department of Dermatology; Hospital de la Santa Creu i Sant Pau; Universitat Autònoma de Barcelona; Barcelona Spain
6. Department of Dermatology and Venerology; Tartu University Hospital; Tartu Estonia