1. Medical Department, Division of Cardiology; Charité-Universitätsmedizin Berlin; Augustenburger Platz 1 13353 Berlin Germany
2. Department of Cardiology and Pneumology; University of Göttingen Medical Centre; Robert-Koch-Str. 40 37075 Göttingen Germany
3. German Center for Cardiovascular Research; Partner Site Berlin and Göttingen; Göttingen Germany