1. RTI International–University of North Carolina at Chapel Hill Evidence-based Practice Center, Chapel Hill
2. Department of Internal Medicine, The Ohio State University, Columbus
3. RTI International, Research Triangle Park, North Carolina
4. Thayer Internal Medicine, MaineGeneral Health, Waterville, Maine
5. Cecil G. Sheps Center for Health Services Research, University of North Carolina at Chapel Hill
6. Department of Medicine, University of North Carolina at Chapel Hill
7. Warwick Medical School, University of Warwick, Coventry, West Midlands, United Kingdom