1. From the Mayo Clinic, Rochester, MN (S.J.P.), and Phoenix, AZ (D.E.S.); Duke University, Durham, NC (C.A.M., J.G.R.); Advocate Christ Medical Center, Chicago, IL (A.J.T.); Sharp Memorial Hospital, San Diego, CA (R.M.A.); Washington University, St Louis, MO (G.A.E.); Jewish Hospital, Louisville, KY (M.S.S.); and Thoratec, Pleasanton, CA (K.S.S., D.J.F.).