1. Division of General Internal Medicine, Massachusetts General Hospital, Boston, Massachusetts.
2. Department of Medicine, Massachusetts General Hospital, Boston, Massachusetts.
3. Department of Medicine, Harvard Medical School, Boston, Massachusetts.
4. Health Unit, RAND Corporation, Santa Monica, California.
5. Suzanne Dworak-Peck School of Social Work and Department of Preventive Medicine, Keck School of Medicine, University of Southern California, Los Angeles, California.
6. Department of Psychiatry, Harvard Medical School, Boston, Massachusetts.
7. Department of Psychology, University of Miami, Miami, Florida.