| Affiliation: | 1. Department of Family Medicine, University of North Carolina at Chapel Hill, , Chapel Hill, North Carolina;2. Cecil G. Sheps Center for Health Services Research, University of North Carolina at Chapel Hill, , Chapel Hill, North Carolina;3. School of Nursing, University of North Carolina at Chapel Hill, , Chapel Hill, North Carolina;4. School of Social Work, University of North Carolina at Chapel Hill, , Chapel Hill, North Carolina;5. U.S. Health Division, Abt Associates Inc., , Cambridge, Massachusetts |
