1. From the Duke Clinical Research Institute (R.D.L., R.H.M., G.E.H., J.B.W., E.D.P., R.A.H., C.M.G., J.H.A.) and the Duke Translational Medicine Institute (R.M.C.), Duke University Medical Center (R.D.L., R.H.M., T.B.W., E.D.P., R.A.H., J.H.A.), Durham, NC; Cardiopulmonary Research Science and Technology Institute, Dallas, TX (M.J.M.); Mid America Heart Institute, St. Luke's Hospital, Kansas City, MO (K.B.A.); PERFUSE Angiographic Laboratory, Boston, MA (C.M.G.); Missouri Baptist Medical Center, St....