1. Psoriasis Research and Treatment Center, Charité–Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany.
2. Department of Dermatology, University of Michigan, Ann Arbor, Michigan, USA.
3. Taubman Medical Research Institute, University of Michigan Medical School, Ann Arbor, Michigan, USA.
4. Division of Dermatology and Venereology, Geneva University Hospitals, Geneva, Switzerland.
5. Department of Dermatology, Erasmus University Medical Center, Rotterdam, The Netherlands.