1. Center for Outcomes Research and Evaluation, Maine Medical Center Research Institute, Maine Medical Center, Portland, Maine.
2. The Dartmouth Institute for Health Policy and Clinical Practice, Dartmouth Medical School, Lebanon, New Hampshire.
3. Department of Pediatrics, Dartmouth Medical School, Hanover, New Hampshire.
4. Department of Community and Family Medicine, Dartmouth Medical School, Hanover, New Hampshire.
5. Norris Cotton Cancer Center, Dartmouth Hitchcock Medical Center, Lebanon, New Hampshire.