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TUESDAY, Dec. 9 (HealthDay News) -- A decade-long study into post-traumatic stress disorder among combat veterans and their identical twins has yielded critical information on the root causes of this devastating condition. The researchers found that both genetic and environmental factors increase the risk of developing post-traumatic stress disorder (PTSD). The work, to be presented Tuesday at the American College of Neuropsychopharmacology annual meeting in Scottsdale, Ariz., was sponsored by both the U.S. National Institute of Mental Health and the Veterans Administration.