Affiliation: | 1. Department of Health Policy and Administration, The Pennsylvania State University, 504S Ford Building, University Park, PA, 16802, USA 2. Department of Health Policy and Management, University of North Carolina, Chapel Hill, 1104G McGavran-Greenberg Hall, Chapel Hill, NC, 27599, USA 3. Department of Health Policy and Management, Texas A & M University, 1266 TAMU, College Station, TX, 77843, USA 4. RTI Health Solutions, Chapel Hill, NC, 27599, USA 5. Department of Maternal and Child Health, University of North Carolina, Chapel Hill, Box 8165, Chapel Hill, NC, 27599, USA 6. North Carolina State Center for Health Statistics, Raleigh, NC, 27699, USA 7. Department of Health Services, University of Washington, 1959 NE Pacific St., Seattle, WA, 98195, USA
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