1 Department of Surgery, Division of Cardiothoracic Surgery, Washington University in St. Louis, MO. (M.R.S., R.V., T.-A.Y., M.M.O.M., C.W.Z., R.B.S., R.J.D.).
2 Department of Biomedical Engineering, Washington University in St. Louis, MO. (C.W.Z., Y.R.).