1 Centre for Evidence-Based Healthcare, Medizinische Fakultät Carl Gustav Carus, TU Dresden, Fetscherstraße 74, 01307, Dresden, Germany. Jochen.Schmitt@uniklinikum-dresden.de.
2 Centre of Evidence Based Dermatology, University of Nottingham, Nottingham, NG7 2NR, U.K.. Jochen.Schmitt@uniklinikum-dresden.de.