1 Department of Dermatology, Venereology and Allergology, Division of Evidence-Based Medicine (dEBM), Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Berlin, Germany.
2 Dermatology, Venereology and Allergology, Immunology Center, Dessau Municipal Hospital, Dessau, Germany.
3 Department of Dermatology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
4 Department of Dermatology and Venereology, University Hospital of Geneva, Geneva, Switzerland.
5 Katholisches Klinikum Mainz, Mainz, Germany.
6 Deutscher Psoriasis Bund e.V., Germany.
7 Psoriasis Center, Department of Dermatology, Venereology, Allergology, University Hospital Schleswig-Holstein, Campus Kiel, Kiel, Germany.
8 Department of Dermatology and Allergy, Klinikum Hanau, Hanau, Germany.
9 Dermatology practice, Oranienburg, Germany.
10 Dermatologikum Hamburg, Hamburg, Germany.
11 Dermatology practice, Osnabrück, Germany.
12 Dermatology practice, Oldenburg, Germany.
13 Berolina Klinik, Löhne, Germany.
14 Dermatology practice, Mahlow, Germany.
15 Dermatology practice, Selters, Germany.
16 Center of Dermatology and Venereology, Hospital of the Johann Wolfgang Goethe University Frankfurt/Main, Frankfurt/Main, Germany.