1 Department of Anesthesiology, Perioperative, and Pain Medicine, Stanford University School of Medicine, Palo Alto, CA, United States.
2 Department of Pediatrics, Faculty of Medicine, University of British Columbia, Vancouver, BC, Canada.
3 BC Children's Hospital Research Institute, Vancouver, BC, Canada.
4 Center for Biobehavioral Health, Nationwide Children's Hospital, Abigal Wexner Research Institute, Columbus, OH, United States.
5 Department of Anesthesiology, Critical Care, and Pain Medicine, Boston Children's Hospital and Department of Psychiatry, Harvard Medical School, Boston, MA, United States.
6 Division of Pediatric Psychology, Connecticut Children's Medical Center, Hartford, CT, United States.
7 Department of Pediatrics, University of Connecticut School of Medicine, Farmington, CT, United States.
8 Department of Psychiatry and Behavioral Health, Nationwide Children's Hospital, Columbus, OH, United States.
9 Department of Pediatrics, Oregon Health & Science University, Portland, OR, United States.
10 Department of Sociology, University of Western Ontario, London, ON, Canada.