1 Department of Psychology, University of Calgary, Calgary, AB T2N 1N4, Canada; Alberta Children's Hospital Research Institute, Calgary, AB, Canada. Electronic address: sheri.madigan@ucalgary.ca.
2 Department of Psychiatry, Hospital for Sick Children, Toronto, ON, Canada; Department of Psychiatry, Temerty Faculty of Medicine, University of Toronto, ON, Canada.
3 Counselling Psychology, Faculty of Education, University of Ottawa, ON, Canada; School of Psychology, Faculty of Social Sciences, University of Ottawa, ON, Canada.
4 Institute for Health and Sport, Victoria University, Melbourne, VIC, Australia.
5 School of Psychology, Faculty of Social Sciences, University of Ottawa, ON, Canada; Children's Hospital of Eastern Ontario, Ottawa, ON, Canada.
6 School of Public Health, Physiotherapy and Sports Science, University College Dublin, Dublin, Ireland.