[1] Harvard Univ, Massachusetts Gen Hosp, Sch Med,Div Cardiol,Dept Med, Healthcare Transformat Lab,Corrigan Minehan Heart, Boston, MA USA
[2] Stanford Univ, Sch Med, Dept Med, Stanford, CA 94305 USA
[3] Amer Heart Assoc, Dallas, TX USA
[4] Aetna Inc, Aetna Fdn, Hartford, CT USA
[5] Univ Connecticut, Sch Med, Farmington, CT USA
[6] Stanford Univ, Dept Med, Sch Med, Div Cardiovasc Med, Stanford, CA 94305 USA