Affiliation: | 1. Departments of Otolaryngology–Head and Neck Surgery, Children's Medical Center, Dallas, Texas, U.S.A;2. Divisions of Pediatric Otolaryngology, Children's Medical Center, Dallas, Texas, U.S.A;3. Anesthesiology and Pain Management, University of Texas Southwestern Medical Center, Children's Medical Center, Dallas, Texas, U.S.A;4. Pediatric Anesthesiology, Children's Medical Center, Dallas, Texas, U.S.A;5. Outcomes Research Consortium, Cleveland, Ohio, U.S.A |