[1] Michael J Crescenz Vet Affairs Med Ctr, Philadelphia, PA USA
[2] Univ Penn, Ctr Cardiovasc Outcomes Qual & Evaluat Res, Philadelphia, PA 19104 USA
[3] Univ Penn, Leonard Davis Inst Hlth Econ, Philadelphia, PA 19104 USA
[4] Yale New Haven Hlth Syst, Ctr Outcomes Res & Evaluat, New Haven, CT USA
[5] Yale Sch Med, Dept Internal Med, Gen Internal Med Sect, New Haven, CT USA
[6] Yale Sch Publ Hlth, Dept Hlth Policy & Management, New Haven, CT USA
[7] Mayo Clin, Div Hlth Care Policy & Res, Rochester, MN USA
[8] Mayo Clin, Robert D & Patricia E Kern Ctr Sci Hlth Care Deli, Rochester, MN USA
[9] San Francisco Vet Affairs Med Ctr, San Francisco, CA USA
[10] Univ Calif San Francisco, Sch Med, Dept Med, Div Cardiol, San Francisco, CA 94143 USA