[1] Harvard Univ, Dana Farber Canc Inst, Dept Pediat Oncol, Dept Psychiat,Med Sch, Boston, MA 02215 USA
[2] Univ Amsterdam, Acad Med Ctr, Emmas Childrens Hosp, Pediat Psychosocial Dept, NL-1105 AZ Amsterdam, Netherlands
[3] Univ Pittsburgh, Dept Pediat Psychiat & Psychol, Pittsburgh, PA USA