In this case, Ramos-Cejudo et al. (56) examined serum CRF levels in veterans with a remote history of TBI, finding reduced levels of circulating CRF in comorbid and PTSD-only participants compared to healthy and TBI-only comparators (d = −0.95, 95% CI: −1.35, −0.55). Here, CRH is linked to post-traumatic stress disorder.