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