[1] Univ Calgary, Dept Psychol, 2500 Univ Dr NW, Calgary, AB T2N 1N4, Canada
[2] Stanford Univ, Dept Anesthesiol Perioperat & Pain Med, Sch Med, Palo Alto, CA USA
[3] Alberta Childrens Hosp Res Inst, Calgary, AB, Canada
[4] Univ Calgary, Dept Community Hlth Sci, Calgary, AB, Canada
[5] Univ Calgary, Dept Pediat & Clin Neurosci, Calgary, AB, Canada
[6] Univ Calgary, Dept Anesthesiol Perioperat & Pain Med, Calgary, AB, Canada