Simeon D, Yehuda R, Knutelska M, Schmeidler J. Dissociation versus posttraumatic stress: cortisol and physiological correlates in adults highly exposed to the World Trade Center attack on 9/11. Psychiatry Res. 2008 Dec 15;161(3):325–9. doi: 10.1016/j.psychres.2008.04.021. PMID: 18930323.