1. Department of Internal Medicine/Cardiology, Heart Center Leipzig at University of Leipzig, Strümpellstr. 39, 04289 Leipzig, Germany
2. Leipzig Heart Institute, Russenstr. 69a, 04289 Leipzig, Germany
3. Duke Heart Center, Duke University Medical Center, Box 3126 DUMC, Durham, NC 27710, USA
4. Department of Internal Medicine/Cardiology/Angiology/Intensive Care Medicine, University Heart Center Luebeck, Ratzeburger Allee 160, 23538 Lübeck, Germany
5. Klinikum Ludwigshafen, Medizinische Klinik B, Bremserstraße 79, D-67063 Ludwigshafen, Germany