Study	Reason for exclusion
Butler 2007	Fatigue was not a necessary inclusion criterion
Gehring 2009	Fatigue was not a necessary inclusion criterion
Gehring 2012	Fatigue was not a necessary inclusion criterion
Kaleita 2006	Fatigue was not a necessary inclusion criterion
Lee 2014	Fatigue was not a necessary inclusion criterion
Locke 2008	Fatigue was not a necessary inclusion criterion
Shaw 2006	Fatigue was not a necessary inclusion criterion. No control group
Shaw 2015	Fatigue was not a necessary inclusion criterion