[1] Hosp Sick Children, Dept Psychol, 555 Univ Ave, Toronto, ON M5G 1X8, Canada
[2] Childrens Hosp Eastern Ontario, Div Haematol Oncol, Ottawa, ON K1H 8L1, Canada
[3] London Hlth Sci Ctr, Dept Psychol, Childrens Hosp, London, England
[4] Hosp Sick Children, Dept Social Work, 555 Univ Ave, Toronto, ON M5G 1X8, Canada