1. Department of Health Care Policy; Harvard Medical School; Boston MA USA
2. University of Michigan; Institute for Social Research; Ann Arbor MI USA
3. National Institute of Mental Health; Bethesda MD USA
4. Center for the Study of Traumatic Stress, Department of Psychiatry; Uniformed Services University School of Medicine; Bethesda MD 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