1. Neurobiology of Selenium, Neuroscience Research Center, Charité Universitätsmedizin Berlin, 10117 Berlin, Germany
2. Institute for Experimental Endocrinology, Charité Universitätsmedizin Berlin, 10117 Berlin, Germany
3. Institute of Molecular Animal Breeding and Biotechnology, Genecenter of the Ludwig-Maximilians University, Munich, Germany
4. Institute of Reproductive Medicine of the University Clinic, Münster, Germany
5. Institute of Pathology, Eberhard Karls Universität, Tübingen, Germany