1 Department of Anesthesiology, Children's Healthcare of Atlanta, Atlanta, GA, United States.
2 Department of Psychology, Palo Alto University, Palo Alto, CA, United States.
3 Department of Pediatrics, Stanford University School of Medicine, Stanford, CA, United States.
4 Department of Anesthesiology, Perioperative and Pain Medicine, Stanford University School of Medicine, Stanford, CA, United States.
5 Independent Researcher.
6 Department of Anesthesiology, University of Michigan School of Medicine, Ann Arbor, MI, United States.
7 Department of Pediatrics & Department of Psychiatry and Behavioral Sciences, Keck School of Medicine of the University of Southern California, Los Angeles, CA, United States.
8 Children's Hospital Los Angeles, Los Angeles, CA, United States.