1. Boehringer Ingelheim GmbH & Co. KG, Ingelheim, Germany
2. Department of Biostatistics, CIMH Mannheim, Mannheim Medical School of the University of Heidelberg, Mannheim, Germany
3. Department of Medical Biostatistics, Epidemiology & Informatics, University Medical Center of the Johannes Gutenberg University Mainz, Mainz, Germany