[1] Boston Univ, Framingham Heart Study, Framingham, MA USA
[2] NHLBI, Framingham, MA USA
[3] Univ Massachusetts, Sch Med, Div Cardiovasc Med, Dept Med,Cardiac Electrophysiol Sect, Worcester, MA 01655 USA
[4] Worcester Polytech Inst, Dept Biomed Engn, Worcester, MA 01609 USA
[5] Univ Groningen, Univ Med Ctr Groningen, Dept Cardiol, Groningen, Netherlands
[6] Boston Univ, Sch Med, Cardiol Sect, Dept Med, Boston, MA 02118 USA
[7] Boston Univ, Sch Med, Dept Med, Prevent Med Sect, Boston, MA 02118 USA
[8] Boston Univ, Sch Publ Hlth, Dept Epidemiol, Boston, MA USA