1. Department of Cancer Epidemiology, German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany
2. Institute of Epidemiology, Helmholtz Centre, 85764 Munich, Germany
3. Department of Genetic Epidemiology, Georg-August University of Göttingen, Medical School, 37073 Göttingen, Germany
4. Thoraxklinik, 69126 Heidelberg, Germany
5. Chair of Epidemiology, Ludwig-Maximilians-University, 80539 Munich, Germany