1. From Lenox Hill Hospital (A.J.L., G.S.R., R.M., M.B.L.), New York, NY; the North Ohio Heart Center (C.D.O.), Elyria; Baptist Medical Center (P.B.M.), Montgomery, Ala; the University of Alabama at Birmingham (L.S.D.); Methodist Hospital (A.E.R.), Houston, Tex; William Beaumont Hospital (R.D.S.), Royal Oak, Mich; Duke Medical Center (J.P.Z.), Durham, NC; Brigham and Women’s Hospital (J.J.P.) and Beth Israel Deaconess Hospital (R.E.K.), Boston, Mass; and MED Institute (J.L.K.), West Lafayette, Ind.