1. From Advocate Christ Medical Center, Oak Lawn, IL (M.S.S., A.J.T.); Duke University Medical Center, Durham, NC (J.G.R., C.A.M.); Johns Hopkins Hospital, Baltimore (S.D.R., J.V.C.); Ohio State University, Columbus (D.F., B.S.); Texas Heart Institute, Houston (R.M.D., O.H.F.); Intermountain Medical Center, Salt Lake City (J.W.L.); Clarian Methodist Hospital, Indianapolis (T.C.W., W.G.); and Thoratec, Pleasanton, CA (D.J.F.).