1. Department of Psychology, The Hospital for Sick Children, Toronto, ON M5G 1X8, Canada
2. Department of Anesthesia and Pain Medicine, The Hospital for Sick Children, Toronto, ON M5G 1X8, Canada
3. Department of Psychology, York University, Toronto, ON M3J 1P3, Canada
4. Lawrence S. Bloomberg Faculty of Nursing, University of Toronto, Toronto, ON M5T 1P8, Canada
5. Department of Anesthesiology and Pain Medicine, Temerty Faculty of Medicine, University of Toronto, Toronto, ON M5S 1A8, Canada