[1] Univ Pittsburgh, Med Ctr, Cardiovasc Inst, Pittsburgh, PA USA
[2] Case Western Reserve Univ, Cleveland, OH 44106 USA
[3] Mt Sinai Med Ctr, Miami Beach, FL 33140 USA
[4] Univ Pittsburgh, Grad Sch Publ Hlth, Dept Epidemiol, Pittsburgh, PA USA
[5] Ctr Medicare & Medicaid Serv, Baltimore, MD USA
[6] Univ Pittsburgh, Grad Sch Publ Hlth, Dept Hlth Policy & Management, Pittsburgh, PA USA
[7] Jefferson Med Coll, Dept Med, Philadelphia, PA USA