[1] Univ Hosp Essen, Ctr Clin Epidemiol, Essen, Germany
[2] Leibniz Univ Hannover, Inst Tech Chem, Hannover, Germany
[3] Univ Hosp Heidelberg, Inst Publ Hlth, Unit Epidemiol & Biostat EpiStat, Heidelberg, Germany
[4] Ludwig Maximilians Univ Munchen, Univ Ctr Hlth Sci, Klinikum Augsburg UNIKA T, Augsburg, Germany
[5] Univ Hosp Hamburg Eppendorf, Inst Med Biometry & Epidemiol, Hamburg, Germany
[6] German Res Ctr Environm Hlth, Inst Epidemiol, Helmholtz Zentrum Munchen, Neuherberg, Germany