1. Department of Dermatology; University of California Irvine Health; Irvine CA USA
2. Department of Internal Medicine; MacNeal Hospital; Berwyn IL USA
3. Department of Dermatology and Cutaneous Surgery; University of Miami Miller School of Medicine; Miami FL USA
4. Psoriasis-Center; Department of Dermatology, Venereology and Allergology; University Medical Center Schleswig-Holstein; Kiel Germany
5. Department of Dermatology and Allergology; Philipps University; Marburg Germany