[1] German Canc Res Ctr, Div Canc Epidemiol, D-6900 Heidelberg, Germany
[2] Univ Halle Wittenberg, Inst Med Epidemiol Biostat & Informat, Halle, Saale, Germany
[3] Fed Inst Occupat Safety & Hlth BAuA, Berlin, Germany
[4] Univ Halle Wittenberg, Univ Clin Internal Med 3, Halle, Saale, Germany