*2.1. Literature Search Strategy*

A literature search was conducted using two major electronic databases: PubMed (https://www. ncbi.nlm.nih.gov/pubmed/) and Web of Science (https://clarivate.com/webofsciencegroup/solutions/ web-of-science/). The search was performed under a filter such that studies published from January of 2009 through November of 2019 were included. The following keywords were used as search terms: (1) "inflammation" AND "PTSD", (2) "inflammation" AND "PTSD" AND "magnetic resonance", (3) "oxidative stress" AND "PTSD", (4) "oxidative stress" AND "PTSD" AND "magnetic resonance". Records obtained from the literature search were reviewed such that duplicates of articles identified between the two databases were removed, and the remaining records were assessed for eligibility and excluded accordingly, under the following eligibility criteria.
