1 See e.g., McMilan, TM, et al., Death after head injury: the 13 year outcome of a case-control study. J. Of Neurology, Neurosurgery, & Psychiatry, Aug. 2011, 92(8): 931-35 (finding that the death rate was elevated for those who’d previously suffered a TBI, including a seven-fold increase in younger adults after a mild head injury); C. Harrison Felix, et al., Cause of death following 1 year post-injury among individuals with traumatic brain injury, J. Head Trauma Rehabil, Jan. 2006, 21(1): 22-33 (finding a statistically significant reduction in long-term survival for those with a mild traumatic brain injury); McMilan, TM, et al., Mortality and Morbidity, 15 years after hospital admission with a mild head injury: a prospective case-controlled population study. J. Of Neurology, Neurosurgery & Psychiatry, Nov. 2014, 85 (11): 1214-20 (finding that younger adults with a mild head injury had a 4.2 fold greater risk of death).
2 Smith, Douglas, et al., Diffuse Axonal Injury in Head Trauma, J. Head Trauma Rehabil. 2003 18(4).