[1] Univ Guelph, Dept Psychol, Guelph, ON N1G 2W1, Canada
[2] Dalhousie Univ, Dept Psychol & Neurosci & Pediat, Halifax, NS B3H 1V7, Canada
[3] Ctr Pediat Pain Res, IWK Hlth, Halifax, NS B3K 6R8, Canada
[4] Western Univ, Schulich Sch Med & Dent, Dept Paediat, London, ON N6A 3K7, Canada
[5] McMaster Childrens Hosp, Pediat Chron Pain Program, Hamilton, ON L8N 3Z5, Canada