[1] St Vincent Med Grp, Indianapolis, IN 46290 USA
[2] Univ Penn, Div Cardiovasc, Philadelphia, PA 19104 USA
[3] Tufts Med Ctr, Boston, MA USA
[4] Cleveland Clin Fdn, Cleveland, OH 44195 USA
[5] Univ Virginia, Charlottesville, VA USA
[6] Novant Heart & Vasc Inst, Charlotte, NC USA
[7] Univ Calif San Francisco, Dept Med, San Francisco, CA USA
[8] Univ Calif San Francisco, Philip R Lee Inst Hlth Policy Studies, San Francisco, CA USA
[9] Cooper Univ Hosp, Camden, NJ 08103 USA