1. Centre of Evidence Based Dermatology University of Nottingham Nottingham U.K
2. Department of Epidemiology and Preventive Medicine University of Regensburg Regensburg Germany
3. Centre for Evidence‐Based Healthcare University Hospital Carl Gustav Carus, TU Dresden Dresden Germany
4. Oregon Health & Science University Department of Dermatology Portland OR U.S.A
5. Department of Dermatology Academic Medical Centre University of Amsterdam Amsterdam the Netherlands