[1] Baylor Coll Med, Houston, TX 77030 USA
[2] Baylor Coll Med, Michael E DeBakey Dept Surg, Houston, TX 77030 USA
[3] Michael E DeBakey VA Med Ctr, Ctr Innovat Qual Effectiveness Safety IQuESt, Houston, TX USA
[4] Baylor Coll Med, Michael E DeBakey Dept Surg, Div Cardiothorac Surg, Houston, TX 77030 USA
[5] Texas Head Inst, Dept Cardiovasc Surg, Houston, TX USA
[6] Baylor Coll Med, Dept Med, Sect Hlth Serv Res, Houston, TX 77030 USA