1. Allegheny County Health Department, Pittsburgh, Pennsylvania;
2. Institute for Community Health, Cambridge, Massachusetts;
3. Department of Medicine, Harvard Medical School, and
4. Group Health Research Institute, Seattle, Washington;
5. Department of Health Services Research, University of Washington, Seattle, Washington;
6. Cambridge Health Alliance, Cambridge, Massachusetts;
7. Harvard Pilgrim Healthcare Institute, Boston, Massachusetts;
8. Department of Population Medicine, Harvard Medical School, Boston, Massachusetts;
9. Department of Child Psychiatry, Massachusetts General Hospital, Boston, Massachusetts; and
10. Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland