1. Community Health Research Program, Hood Center for Children and Families, Dartmouth Medical School, Lebanon, New Hampshire.
2. Department of Pediatrics, Dartmouth Medical School, Lebanon, New Hampshire.
3. Cancer Control Program, Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire.
4. Department of Medicine, Dartmouth Medical School, Lebanon, New Hampshire.
5. Department of Community and Family Medicine, Dartmouth Medical School, Lebanon, New Hampshire.
6. Cancer Epidemiology and Chemoprevention Research Program, Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire.
7. Department of Anesthesia, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire.