1. From the Department of Cardiology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands (M.R.); National Heart Lung and Blood Institute's and Boston University's Framingham Heart Study, Framingham, MA (D.D.M., E.J.B.); Cardiac Electrophysiology Section, Department of Medicine, University of Massachusetts Medical School, Worcester, MA (D.D.M.); Department of Biomedical Engineering, Worcester Polytechnic Institute, Worcester, MA (D.D.M.); Cardiology Section,...