"PTSD: A Growing Epidemic," diagnosed 31 percent of Vietnam veterans female veterans are are a higher risk National Institute of Health diagnosed growing epidemic US Department of Veterans Affairs National Institutes of Health National Institutes of Health U.S. Department of Veterans Affairs PTSD NIH reports, growing epidemic traumatic brain injury U.S. Department of Veterans Affairs (VA) estimates that PTSD affects common condition National Institute of Health 7.7 million U.S. Department of Veterans Affairs National Institute of Health 10% of veterans National Institutes of Health National Institute of Health MEDLINEPLUS estimates that PTSD affects MedlinePlus 7.7 million adults National Institute of Health NIH Medline Plus U.S. Department of Veterans Affairs growing epidemic 7.7 million Vietnam veterans military veterans PTSD afflicts National Institute of Health