1. Institute of Medical Informatics, Biometry and Epidemiology, University Hospital Essen University of Duisburg‐Essen Essen North Rhine‐Westphalia Germany
2. Centre for Clinical Trials Essen (ZKSE), University Hospital Essen University of Duisburg‐Essen Essen Germany
3. Center of Clinical Epidemiology; c/o Institute of Medical Informatics, Biometry and Epidemiology, University Hospital Essen University of Duisburg‐Essen Essen Germany
4. Department of Pharmacology Johannes Gutenberg University Mainz Germany
5. Partnership for the Assessment and Accreditation of Scientific Practice Heidelberg Germany
6. Department of Epidemiology, Gillings School of Global Public Health University of North Carolina Chapel Hill NC USA
7. School of Public Health, Department of Epidemiology Boston University Boston USA