1. From the Children’s Hospital of Philadelphia (T.M.H., G.W., T.L.S.), Philadelphia, Pa; Medical University of South Carolina (A.M.A.), Charleston, SC; University of Michigan Hospital (T.J.K.), Ann Arbor, Mich; Children’s Hospital Medical Center (D.P.N.), Cincinnati, Ohio; Texas Children’s Hospital (A.C.C.), Houston, Tex; Emory University School of Medicine (J.M.B.), Atlanta, Ga; Sanofi-Synthelabo Inc (A.A., J.F.K.) New York, NY; Covance Periapproval Services Inc (R.K.), Radnor, Pa; and Boston...