1. Department of Anesthesiology, Perioperative and Pain Medicine, and Department of Pediatrics, Stanford University, Stanford, California;
2. Packard Children’s Hospital at Stanford, and Stanford Children's Health, Palo Alto, California;
3. Department of Anesthesiology, and Department of Pediatrics, Medical College of Wisconsin, Milwaukee, Wisconsin;
4. Children’s Hospital of Wisconsin, Wauwatosa, Wisconsin;
5. Department of Anesthesiology and Pain Medicine, and Department of Psychiatry, University of Washington, Seattle, Washington; and
6. Seattle Children’s Hospital and Regional Medical Center, Seattle, Washington