1. Department of Cardiology; Suedharz-Hospital; Robert-Koch-Strasse 39 99734 Nordhausen Germany
2. Department of Anatomy; University of Turku; Kiinamyllynkatu 10 20520 Turku Finland
3. Department of Cardiology; University of Tübingen; Otfried-Müller-Strasse 10 72076 Tübingen Germany
4. Department of Cardiology; University of Mainz; Langenbeckstrasse 1 55101 Mainz Germany
5. Department of Cardiology; University of Halle-Wittenberg; Universitätsplatz 10 06108 Halle/Saale Germany
6. Department of Cardiology; Vivantes Hospital Neukölln; Rudowerstrasse 48 12351 Berlin Germany
7. Department of Laboratory Diagnostics; Helsinki University Central Hospital; POB 340 00029 Helsinki Finland
8. Department of Medicine; Helsinki University Central Hospital; POB 340 00029 Helsinki Finland