[1] Univ Minnesota, Dept Surg, Div Thorac & Foregut Surg, Minneapolis, MN 55455 USA
[2] Univ Minnesota, Dept Surg, Div Cardiothorac Surg, Minneapolis, MN 55455 USA
[3] Univ Minnesota, Dept Surg, Div Pulm & Crit Care Med, Minneapolis, MN 55455 USA
[4] Univ So Calif, Keck Sch Med, Dept Cardiothorac Surg, Los Angeles, CA 90033 USA