1 Department of Anesthesiology, Harvard Medical School, Boston, Massachusetts2Pain Treatment Service, Department of Anesthesiology, Perioperative, and Pain Medicine, Boston Children's Hospital, Boston, Massachusetts.
2 Departments of Anesthesiology and Pain Medicine, Pediatrics, and Psychiatry, University of Washington School of Medicine, Seattle4Department of Anesthesiology and Pain Medicine, Seattle Children's Hospital, Seattle.