[1] Univ Pittsburgh, Sch Nursing, 336 Victoria Bldg, Pittsburgh, PA 15261 USA
[2] Univ Leeds, Leeds Inst Canc & Pathol, St Jamess Hosp, Beckett St, Leeds LS9 7TF, W Yorkshire, England
[3] Univ Leeds, Leeds Inst Hlth Sci, Worsley Bldg,Clarendon Way, Leeds LS2 9NL, W Yorkshire, England
[4] Vrije Univ Amsterdam, Dept Clin Neuro & Dev Psychol, Van der Boechorststr 1-3, NL-1081 BT Amsterdam, Netherlands
[5] Vrije Univ Amsterdam, Med Ctr, Dept Med Psychol, POB 7057, NL-1007 MB Amsterdam, Netherlands
[6] Univ Pittsburgh, Med Ctr, Hillman Canc Ctr, Div Neurooncol, 5115 Ctr Ave, Pittsburgh, PA 15232 USA