[1] Beth Israel Deaconess Med Ctr, Boston, MA 02215 USA
[2] NHLBI, Framingham Heart Study, Boston, MA USA
[3] Beth Israel Deaconess Med Ctr, Framingham, MA USA
[4] NHLBI, Framingham Heart Study, Framingham, MA USA
[5] Boston Univ, Boston, MA 02215 USA
[6] Boston Univ, Framingham, MA USA
[7] Massachusetts Gen Hosp, Boston, MA 02114 USA
[8] Cardiovasc Engn Inc F, Norwood, MA USA