IL10 and post-traumatic stress disorder: Contrary to expectations of the opposition roles between proinflammatory and anti-inflammatory cytokine alterations in response to oxidative stress and inflammation, findings from the selected studies have mostly demonstrated statistically similar levels of serum IL-10 between individuals with PTSD and trauma-exposed controls who have never been diagnosed with PTSD [15,16,25,44,45,57,68,69,70].