To the Editor Mac Donald et al1 propose possible unmeasured covariates as a potential limitation to their study on long-term clinical outcomes among patients with combat-related mild traumatic brain injuries (mTBIs). We believe it is important to clarify the extent to which recall bias and confounding variables may have affected the conclusions of the study, specifically pertaining to psychiatric conditions.
Smith LAG, Vipler LBS. Mild Traumatic Brain Injury and Mental Health. JAMA Neurol. 2017;74(11):1377–1378. doi:10.1001/jamaneurol.2017.2768
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