1. University of Leipzig, Heart Centre, Department of Internal Medicine/Cardiology, Germany
2. Klinikum Weißenfels, Department of Cardiology and Angiology, Germany
3. University of Leipzig, Institute for Laboratory Medicine, Clinical Chemistry and Molecular Diagnostics, Germany
4. Klinikum Links der Weser, Department of Cardiology and Angiology, Bremen, Germany
5. Martin-Luther-University Halle/Wittenberg, University Hospital, Department of Internal Medicine III, Halle/Saale, Germany