[1] Massachusetts Gen Hosp, Cardiac Arrhythmia Serv, Boston, MA 02114 USA
[2] Massachusetts Gen Hosp, Cardiovasc Res Ctr, Boston, MA 02114 USA
[3] Brigham & Womens Hosp, Div Prevent Med, Boston, MA 02115 USA
[4] Univ Munich, Dept Med 1, Univ Hosp Grosshadern, Munich, Germany
[5] Boston Univ, Framingham, MA USA
[6] NHLBI, Framingham Heart Study, Framingham, MA USA
[7] Boston Univ, Sch Med, Dept Med, Boston, MA 02118 USA
[8] Boston Univ, Sch Med, Dept Prevent Med, Boston, MA 02118 USA
[9] Boston Univ, Sch Med, Whitaker Cardiovasc Inst, Boston, MA 02118 USA
[10] Boston Univ, Sch Med, Cardiol Sect, Boston, MA 02118 USA