1. Department of Internal Medicine III, Division of Cardiology, Pneumology, Angiology and Intensive Care, University of Cologne, Germany (M.I.K., S.B., R.P.).
2. Department of Cardiology, Friedrich-Alexander-University Erlangen-Nürnberg, Germany (M.L., M.A.).
3. Clinic for General and Interventional Cardiology/Angiology, Ruhr-University Bochum, Bad Oeynhausen, Germany (M.G., K.P.F., V.R.).
4. Department of Cardiology and Pneumology, Heart Center, Georg-August-University Goettingen, Germany (B.E.B.).
5. Department of Cardiology, Angiology and Intensive Care, Vincentius-Diakonissen Hospital Karlsruhe, Germany (M.P., C.J.).