[1] Concordia Univ, Psychol, Montreal, PQ, Canada
[2] Fred Hutchinson Canc Res Ctr, Div Clin Res, 1124 Columbia St, Seattle, WA 98104 USA
[3] Univ Washington, Dept Rehabil Med, Seattle, WA 98195 USA
[4] St Jude Childrens Res Hosp, Psychol & Biobehav Sci, 332 N Lauderdale St, Memphis, TN 38105 USA
[5] Hosp Sick Children, Child Hlth Evaluat Sci, Toronto, ON, Canada
[6] Hosp Sick Children, Haematol Oncol, Toronto, ON, Canada
[7] St Jude Childrens Res Hosp, Dept Epidemiol & Canc Control, 332 N Lauderdale St, Memphis, TN 38105 USA