[1] Berlin Inst Technol, Dept Food Chem & Toxicol, D-13355 Berlin, Germany
[2] TraceAge DFG Res Unit Interact Essential Trace El, D-13353 Potsdam, Germany
[3] Charite Univ Med Berlin, Inst Expt Endokrinol, D-13353 Berlin, Germany
[4] Free Univ Berlin, D-13353 Berlin, Germany
[5] Humboldt Univ, D-13353 Berlin, Germany
[6] Berlin Inst Hlth, CVK, Sudring 10, D-13353 Berlin, Germany