1. From the University of Mississippi Medical Center, Jackson (D.W.J.); Duke University, Durham, NC (E.D.P.); Northwestern University Medical Center, Evanston, Ill (R.O.B.); Denver Health Medical Center, Denver, Colo (F.A.M.); University of California at Los Angeles Medical Center (G.C.F.); University of North Carolina at Chapel Hill (S.C.S.); American Heart Association, Dallas, Tex (P.S., M.G., P.C.H., A.L.); and Mayo Clinic, Rochester, Minn (R.J.G.).