NEFL and post-traumatic stress disorder: Specifically, we hypothesised that: (1) plasma concentrations of NfL and GFAP would be significantly increased after TBI; (2) that combat TBI would be associated with worse psychiatric (anxiety, depressive and PTSD symptoms) and functional outcomes (employment status, 6 min walk distance25 and quality of life) and (3) that such outcomes and plasma concentrations of NfL and GFAP would be associated in patients after TBI.