1. Department of Psychiatry, Uniformed Services University, Bethesda, Maryland
2. Henry M. Jackson Foundation for the Advancement of Military Medicine, Bethesda, Maryland
3. Department of Health Care Policy, Harvard Medical School, Boston, Massachusetts
4. Department of Psychiatry, Massachusetts General Hospital, Boston, Massachusetts
5. Department of Psychiatry, University of California San Diego, La Jolla, California
6. Psychiatric Service, VA San Diego Healthcare System, San Diego, California
7. Institute for Social Research, University of Michigan, Ann Arbor, Michigan