1. The Czech Academy of Sciences, Institute of Scientific Instruments, Department of Medical Signals, Brno, (F.P., P.J., J.H., P.N., I.V., V.V.).
2. International Clinical Research Center, St. Anne’s University Hospital, Brno, Czech Republic (P.L.).
3. Heart Research Follow-up Program, University of Rochester Medical Center, NY (S.M., B.P., A.J.M., W.Z., J.-P.C.).