1. Department of Cardiology, Heart and Diabetes Center North Rhine-Westphalia; Ruhr University; Bochum Georgstrasse 11, D-32545 Bad Oeynhausen Germany
2. Institute of Laboratory and Transfusion Medicine, Heart and Diabetes Center North Rhine-Westphalia; Ruhr University; Bochum Georgstrasse 11, D-32545 Bad Oeynhausen Germany