The drugmaker has been struggling with falling prices of generics and faces lawsuits that allege it helped fuel the U.S. opioid addiction epidemic.
Suicide rates are higher among veterans suffering from PTSD, which is estimated to affect between 11% and 20% of those who served in the military.
The study, presented at the European Academy of Neurology Congress on Sunday, compared the brain function of 28 survivors with the one of people whose family had not been involved in the Holocaust.