1. Division of Clinical Epidemiology and Aging Research, German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany
2. Medical Faculty Heidelberg, Heidelberg University, 69117 Heidelberg, Germany
3. Clinic Niederrhein, 52474 Bad Neuenahr-Ahrweiler, Germany
4. Clinic Bad Salzelmen, 39218 Schönebeck, Germany
5. Clinic Rosenberg, 33014 Bad Driburg, Germany
6. National Center for Tumor Diseases (NCT), German Cancer Consortium (DKTK), German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany