A total of 32 studies exclusively included patients with TBI: six single cases, 11 analyzing all participants as a single group, eight grouping participants according to some clinical feature (e.g., severity of TBI, disability, history of suicide attempt, anosmia) and seven randomized control trials comparing groups by treatment (e.g., cognitive rehabilitation, growth hormone replacement therapy, sertraline medication, neuro-feedback training). This evidence concerns the gene GH1 and Anosmia.