[1] Sydney Childrens Hosp, Behav Sci Unit, Ctr Childrens Canc & Blood Disorders, Sydney, NSW 2031, Australia
[2] Univ NSW, Sch Womens & Childrens Hlth, Sydney, NSW, Australia
[3] Univ NSW, Prince Wales Clin Sch, Sydney, NSW, Australia
[4] Univ Sydney, Sch Psychol, Sydney, NSW 2006, Australia