Overview of Studies.

I = intervention, C = control, RCT = Randomized controlled trial; AAN Classes[64]: I = rigorous RCT; II = matched prospective cohort studies or RCTs in a representative population lacking one of the criteria in class I; III = all other controlled trials; IV, all other studies *sample size at initial enrolment; final sample of 38 intervention and 34 control participants; **sample size at initial enrolment; final sample of 71 participants; ***sample had majority of participants with TBI and was therefore included in this review. Overview of Studies.