Affiliation: | 1. Department of Health Policy and Management, The Gillings School of Global Public Health, Cecil G. Sheps Center for Health Services Research, The University of North Carolina at Chapel Hill, Chapel Hill, NC;2. American Institutes for Research, Chapel Hill, NC;3. The University of Texas School of Public Health, Houston, TX;4. Department of Health Policy and Management, Cecil G. Sheps Center for Health Services Research, Chapel Hill, NC |