| Affiliation: | 1. Cecil G. Sheps Center for Health Services Research, University of North Carolina at Chapel Hill, , Chapel Hill, North Carolina;2. School of Social Work, University of North Carolina at Chapel Hill, , Chapel Hill, North Carolina;3. Department of Family Medicine, University of North Carolina at Chapel Hill, , Chapel Hill, North Carolina;4. Abt Associates, Inc., , Cambridge, Massachusetts;5. School of Nursing, University of North Carolina at Chapel Hill, , Chapel Hill, North Carolina;6. Department of Medicine, School of Medicine, University of North Carolina at Chapel Hill, , Chapel Hill, North Carolina |
