[1] Univ Iowa, Dept Surg, Iowa City, IA 52242 USA
[2] Columbia Univ, Dept Surg, New York, NY USA
[3] Bryan LGH Heart Inst, Lincoln, NE USA
[4] Texas Heart Inst, Dept Surg, Houston, TX USA
[5] Brigham & Womens Hosp, Div Cardiovasc Surg, Boston, MA USA
[6] Univ Michigan, Sect Cardiac Surg, Ann Arbor, MI USA
[7] Thoratec Corp, Pleasanton, CA USA
[8] Alton Ochsner Med Fdn & Ochsner Clin, Dept Thorac & CV Surg & Transplant, New Orleans, LA 70121 USA
[9] Allegheny Gen Hosp, Dept Cardiothorac Surg, Pittsburgh, PA 15212 USA
[10] Columbia Univ, Int Ctr Hlth Outcomes & Innovat Res, New York, NY USA
[11] LDS Hosp, Dept Surg, Salt Lake City, UT USA