1. Federated Information Systems, German Cancer Research Center (DKFZ), Heidelberg, Germany
2. Complex Data Processing in Medical Informatics, University Medical Center Mannheim, Mannheim, Germany
3. Institute of Medical Biostatistics, Epidemiology and Informatics, Johannes Gutenberg-Universität Mainz, Universitätsmedizin, Mainz, Germany
4. Department Epidemiology of Health Care and Community Health, Institute for Community Medicine, University Medicine Greifswald, Greifswald, Germany