[1] Brigham & Womens Hosp, Dept Med, Div Cardiovasc, Noninvas Cardiovasc Imaging Program, Boston, MA 02115 USA
[2] Brigham & Womens Hosp, Dept Radiol, Boston, MA 02115 USA
[3] Harvard Univ, Sch Med, Boston, MA USA
[4] Brigham & Womens Hosp, Adv Heart Dis Program, Boston, MA 02115 USA