1. RTI International–University of North Carolina at Chapel Hill Evidence-Based Practice Center2RTI International, Research Triangle Park, North Carolina
2. RTI International–University of North Carolina at Chapel Hill Evidence-Based Practice Center3Department of Medicine, University of North Carolina at Chapel Hill4Cecil G. Sheps Center for Health Services Research, University of North Carolina at Chapel Hill
3. RTI International–University of North Carolina at Chapel Hill Evidence-Based Practice Center4Cecil G. Sheps Center for Health Services Research, University of North Carolina at Chapel Hill