title: Reply.
authors.affiliation: The Departments of Pediatrics and, Pharmacology, University of Missouri-Kansas City, The Sections of Pediatric Clinical Pharmacology, and Experimental Therapeutics, and Clinical Toxicology, Childrenís Mercy Hospital, Kansas City, MO 64108.
authors.initials: GL
authors.lastname: Kearns
authors.initials: JS
authors.lastname: Leeder
authors.initials: GS
authors.lastname: Wasserman