1. Department of Dermatology, Venereology and Allergology; Johann Wolfgang Goethe-University Hospital; Frankfurt am Main Germany
2. Evidence-Based Medicine Frankfurt, Institute of General Practice; Goethe University; Frankfurt Germany
3. Hautklinik; Städtisches Klinikum Karlsruhe; Karlsruhe Germany
4. Department of Dermatology; University of California Davis; Sacramento CA USA
5. Center for Evidence-Based Healthcare; Faculty of Medicine Carl Gustav Carus, Technischen Universität (TU) Dresden; Dresden Germany
6. c/o Cochrane Skin Group; The University of Nottingham; Nottingham UK