[1] Univ Texas Houston, McGovern Medical Sch, Dept Adv Cardiopulm Therapies & Houston, Houston, TX USA
[2] Baylor Coll Med, Michael E DeBakey VA Med Ctr, Ctr Med Eth, Dept Med & Clin Eth, Houston, TX USA
[3] Univ Miami, Miller Sch Med, Div Cardiol, Miami, FL USA
[4] Univ Chicago Med, Div Cardiol, Chicago, IL USA
[5] Thomas Jefferson Univ Hosp, Div Cardiol, Philadelphia, PA USA
[6] Mt Sinai Hosp, Cardiovasc Inst, Cardiol Dept, New York, NY USA
[7] Univ Texas Hlth Sci Ctr, McGovern Med Sch, Dept Cardiovasc Med, Div Adv Cardiopulm Therap & Transplantat, 6400 Fannin St, Suite 2350, Houston, TX 77004 USA