1. Centre for Evidence‐Based Healthcare University Hospital Carl Gustav Carus Technische Universität Dresden Fetscherstraße 74 D‐01307 Dresden Germany
2. Department of Occupational and Social Medicine Medical Faculty Carl Gustav Carus Technische Universität Dresden Fetscherstraße 74 D‐01307 Dresden Germany
3. Division of Evidence Based Medicine (dEBM) Department of Dermatology Charité – Universitätsmedizin Berlin Charitéplatz 1 10117 Berlin Germany