[1] St Lukes Episcopal Hosp, Texas Heart Inst, Cardiol Sect, Dept Med, Houston, TX 77030 USA
[2] Baylor Coll Med, Dept Med, Houston, TX 77030 USA
[3] Hlth Serv Res & Dev Ctr Excellence, Michael E DeBakey Vet Affairs Med Ctr, Hlth Policy Qual & Informat Program, Houston, TX 77030 USA
[4] Baylor Coll Med, Dept Med, Sect Cardiovasc Res, Houston, TX 77030 USA
[5] Houston Methodist DeBakey Heart & Vasc Ctr, Ctr Cardiovasc Dis Prevent, Houston, TX 77030 USA
[6] Michael E DeBakey VA Med Ctr, Cardiol Sect, Houston, TX 77030 USA
[7] Michael E DeBakey VA Med Ctr, Hlth Serv Res & Dev 152, Houston, TX 77030 USA