1. From the Department of Cardiology, Pneumology, Angiology, Intensive Care Medicine, University Hospital RWTH Aachen, Aachen, Germany (E.A., S.H., K.B., S.R., M.B., J.S., M.A., N.M., R.H.); and Department of Medical Statistics, Informatics and Epidemiology, University of Cologne, Cologne, Germany (K.K., W.L.).