1. Department of Cardiology and Pneumology; University of Goettingen; 37075 Goettingen Germany
2. Coordination Center for Clinical Trials; University of Leipzig; Leipzig Germany
3. Department of Cardiology; Medical University Graz; Graz Austria
4. Department of Cardiology; Charité-Universitätsmedizin; Berlin Germany
5. Department of Clinical Chemistry; University of Goettingen; Goettingen Germany
6. Department of Psychosomatic Medicine; University of Goettingen; Goettingen Germany