Rolf Wachter1, Klaus Gröschel2. 1. Clinic for Cardiology and Pneumology, University of Göttingen, Göttingen, Germany; DZHK (German Centre for Cardiovascular Research), partner site, 37099 Göttingen, Germany. Electronic address: wachter@med.uni-goettingen.de. 2. Department of Neurology, University Medical Centre of the Johannes Gutenberg University Mainz, Mainz, Germany.