[1] Univ Hosp Leipzig, Inst Lab Med Clin Chem & Mol Diagnost, D-04103 Leipzig, Germany
[2] Univ Birmingham, CEDAM, Birmingham B15 2TT, W Midlands, England
[3] Univ So Calif, Keck Sch Med, Dept Obstet & Gynecol, Los Angeles, CA 90033 USA
[4] Univ So Calif, Keck Sch Med, Dept Prevent Med, Los Angeles, CA 90033 USA
[5] Helmholtz Zentrum Muenchen, German Res Ctr Environm Hlth, Inst Expt Genet, Genome Anal Ctr, D-85764 Neuherberg, Germany