1. Institute of Clinical Chemistry and Laboratory Medicine, Ernst Moritz Arndt University Greifswald, Greifswald, Germany;
2. Institute for Community Medicine, Ernst Moritz Arndt University Greifswald, Greifswald, Germany;
3. Department of Cardiology, Ernst Moritz Arndt University Greifswald, Greifswald, Germany;
4. Institute of Pharmacology, Ernst Moritz Arndt University Greifswald, Greifswald, Germany;
5. Division of Neuroendocrinology, Department of Neurosurgery, Friedrich-Alexander-University Erlangen, Nuremberg, Germany.