1. Chronic Disease Epidemiology, Yale School of Public Health, New Haven, Connecticut.
2. The Fenway Institute, Fenway Health, Boston, Massachusetts.
3. RAND Corporation, Boston, Massachusetts.
4. Section of General Internal Medicine, Boston University School of Medicine, Boston, Massachusetts.
5. Division of General Pediatrics/Harvard Medical School, Boston Children's Hospital, Boston, Massachusetts.
6. Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, Massachusetts.