[1] West Virginia Univ, Dept Cardiovasc & Thorac Surg, 1 Med Ctr Dr, Morgantown, WV 26506 USA
[2] Baylor Coll Med, Div Gen Surg, Michael E DeBakey Dept Surg, Houston, TX 77030 USA
[3] Baylor Coll Med, Div Cardiothorac Surg, Michael E DeBakey Dept Surg, Houston, TX 77030 USA
[4] Vanderbilt Univ, Med Ctr, Dept Cardiac Surg, Nashville, TN USA
[5] Stanford Med, Dept Cardiothorac Surg, Palo Alto, CA USA
[6] East Carolina Univ, Dept Surg, Brody Sch Med, Greenville, NC 27858 USA
[7] Assoc Amer Med Coll, Washington, DC USA
[8] Univ Connecticut, Div Cardiothorac Surg, Farmington, CT USA