Study	Reason for exclusion
Attia 2012	Not a controlled trial.
Boele 2013	Study included > 20% non‐irradiation patients and did not analyse cranial irradiation patients separately.
Chan 2003	Patients not randomised.
Gehring 2009	Study included > 20% non‐irradiation patients and did not analyse cranial irradiation patients separately.
Hulshof 2002	Patients not randomised.
Jatoi 2005	1 participant completed the study.
Levin 2011	The primary outcome not cognitive functioning or other quality of life measure.
Meyers 1998	Not a controlled trial.
Schellart 2011	Patients not randomised.
Shaw 2006	Not a controlled trial.