1. Department of Health Care Policy; Harvard Medical School; Boston MA USA
2. National Institute of Mental Health; Bethesda MD USA
3. Center for the Study of Traumatic Stress, Department of Psychiatry, Uniformed Services; University School of Medicine; Bethesda MD USA
4. Institute for Social Research; University of Michigan; Ann Arbor MI USA
5. Department of Psychology; Harvard University; Cambridge MA USA
6. Departments of Psychiatry and Family and Preventive Medicine; University of California San Diego; La Jolla CA USA
7. VA San Diego Healthcare System; San Diego CA USA