1 Department of Internal Medicine II - Cardiology/Pneumology, University of Bonn, Sigmund-Freud-Str. 25, D-53127 Bonn, Germany. Electronic address: dirk.skowasch@ukbonn.de.
2 Department of Internal Medicine II - Cardiology/Pneumology, University of Bonn, Sigmund-Freud-Str. 25, D-53127 Bonn, Germany.