1. Institute of Medical Epidemiology, Biostatistics and Informatics; Martin-Luther-University Halle-Wittenberg; Halle Germany
2. Department of Internal Medicine III; Martin-Luther-University Halle-Wittenberg; Halle Germany
3. Division of Cancer Epidemiology; German Cancer Research Centre; Heidelberg Germany
4. Institute of Laboratory Medicine, Clinical Chemistry and Molecular Diagnostics; University of Leipzig; Leipzig Germany