[1] Yale Univ, Sch Med, Sect Cardiovasc Med,Dept Med, New Haven Hosp Ctr Outcomes Res & Evaluat, New Haven, CT 06520 USA
[2] Yale Univ, Sch Med, Dept Epidemiol & Publ Hlth, Sect Chron Dis Epidemiol, New Haven, CT 06520 USA
[3] QUALIDIGM, Middletown, CT USA