[1] Univ Louisville, Cardiovasc Med, Louisville, KY 40292 USA
[2] Univ Utah, Cardiovasc Med, Salt Lake City, UT USA
[3] Univ Utah, Cardiovasc Surg, Salt Lake City, UT USA
[4] Cleveland Clin, Cardiovasc Med, Cleveland, OH 44106 USA
[5] Univ Louisville, Clin Trials Unit, Louisville, KY 40292 USA
[6] Univ Louisville, Cardiovasc Surg, Louisville, KY 40292 USA
[7] Montefiore, Dept Echocardiog, New York, NY USA
[8] Univ Penn, Cardiovasc Surg, Philadelphia, PA 19104 USA
[9] Univ Nebraska, Cardiovasc Med, Omaha, NE 68182 USA
[10] Montefiore, Cardiovasc Med, New York, NY USA
[11] Thoratec Corp, Pleasanton, CA USA
[12] Univ Penn, Cardiovasc Med, Philadelphia, PA 19104 USA