[1] Univ Chicago, Dept Surg, Chicago, IL USA
[2] Univ Chicago, MacLean Ctr Clin Med Eth, Chicago, IL USA
[3] Virginia Commonwealth Univ, Dept Surg, Div Cardiothorac Surg, Richmond, VA USA
[4] Cent Virginia VA Healthcare Syst, Dept Surg, Richmond, VA USA
[5] Med Univ South Carolina, Dept Surg, Div Surg Oncol, Charleston, SC USA
[6] Univ Wisconsin, Dept Surg, Div Vasc Surg, Madison, WI USA
[7] Med Univ South Carolina, Dept Med, Div Gen Med, Charleston, SC USA
[8] Univ Southern Calif, Div Thorac Surg, Dept Surg, Los Angeles, CA USA
[9] Med Univ South Carolina, Dept Surg, Div Cardiothorac Surg, 30 Courtenay Dr,MSC 295, Charleston, SC 29425 USA