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