1. University Hospital Bristol NHS Foundation Trust UK
2. Centre of Evidence Based Dermatology University of Nottingham Nottingham UK
3. Department of Biostatistics University of Liverpool Liverpool UK
4. Population Health Sciences University of Bristol Bristol UK
5. Center for Evidence‐based Healthcare Medizinische Fakultät, Technische Universität Dresden Dresden Germany
6. Centre for Biostatistics Manchester Academic Health Science Centre The University of Manchester Manchester UK