[1] Yale Univ, Sch Med, Dept Internal Med, Sect Cardiovasc Med, New Haven, CT 06520 USA
[2] Yale Univ, Sch Med, Dept Epidemiol & Publ Hlth, Sect Hlth Policy & Adm, New Haven, CT 06520 USA
[3] Qualidigm, Middletown, CT USA
[4] Flying Buttress Associates, Charlottesville, VA USA
[5] Denver Hlth Med Ctr, Dept Med, Div Cardiol, Denver, CO USA
[6] Univ Colorado, Hlth Care Sci Ctr, Div Geriatr Med, Denver, CO 80202 USA
[7] Univ Colorado, Hlth Care Sci Ctr, Dept Med, Div Cardiol, Denver, CO 80202 USA
[8] Colorado Fdn Med Care, Aurora, CO USA
[9] Ctr Medicare & Medicaid Serv, Boston, MA USA