1. University of Münster, Institute of Inorganic and Analytical Chemistry, Corrensstrasse 30, 48149 Münster, Germany, Ruhr-University of Bochum, Marienhospital Herne, Department of Medicine I, Hölkeskampring 40, 44625 Herne, Germany, Environmental Specimen Bank for Human Tissues, Domagkstrasse 11, 48149 Münster, Germany, and Center for Radiology and Nuclear Medicine Münster, Von-Steuben-Strasse 10a, 48143 Münster, Germany